Bump towncrier from 25.8.0 to 26.9.0

[dependabot]

Bumps towncrier from 25.8.0 to 26.9.0.

Release notes

Sourced from towncrier's releases.

Towncrier 26.9.0

Features

• towncrier build now support setting the date via the SOURCE_DATE_EPOCH specification. This adds support for Reproducible Builds. ([#746](https://github.com/twisted/towncrier/issues/746) <https://github.com/twisted/towncrier/issues/746>_)
• Wrapped line length can now be configured by setting wrap to an integer value greater than 0, using 79 by default if set to true. ([#464](https://github.com/twisted/towncrier/issues/464) <https://github.com/twisted/towncrier/issues/464>_)
• The towncrier create command line tool now has the --sub-issue option that is used when creating multiple fragments for the same issue number. ([#714](https://github.com/twisted/towncrier/issues/714) <https://github.com/twisted/towncrier/issues/714>_)

Bugfixes

• towncrier create now rejects fragment names whose issue identifier contains .. ([#733](https://github.com/twisted/towncrier/issues/733) <https://github.com/twisted/towncrier/issues/733>_)

Misc

• [#719](https://github.com/twisted/towncrier/issues/719) <https://github.com/twisted/towncrier/issues/719>, [#729](https://github.com/twisted/towncrier/issues/729) <https://github.com/twisted/towncrier/issues/729>, [#736](https://github.com/twisted/towncrier/issues/736) <https://github.com/twisted/towncrier/issues/736>, [#741](https://github.com/twisted/towncrier/issues/741) <https://github.com/twisted/towncrier/issues/741>, [#747](https://github.com/twisted/towncrier/issues/747) <https://github.com/twisted/towncrier/issues/747>_

Towncrier 26.9.0rc1

Features

• towncrier build now support setting the date via the SOURCE_DATE_EPOCH specification. This adds support for Reproducible Builds. ([#746](https://github.com/twisted/towncrier/issues/746) <https://github.com/twisted/towncrier/issues/746>_)
• Wrapped line length can now be configured by setting wrap to an integer value greater than 0, using 79 by default if set to true. ([#464](https://github.com/twisted/towncrier/issues/464) <https://github.com/twisted/towncrier/issues/464>_)
• The towncrier create command line tool now has the --sub-issue option that is used when creating multiple fragments for the same issue number. ([#714](https://github.com/twisted/towncrier/issues/714) <https://github.com/twisted/towncrier/issues/714>_)

Bugfixes

• towncrier create now rejects fragment names whose issue identifier contains .. ([#733](https://github.com/twisted/towncrier/issues/733) <https://github.com/twisted/towncrier/issues/733>_)

Misc

• [#719](https://github.com/twisted/towncrier/issues/719) <https://github.com/twisted/towncrier/issues/719>, [#729](https://github.com/twisted/towncrier/issues/729) <https://github.com/twisted/towncrier/issues/729>, [#736](https://github.com/twisted/towncrier/issues/736) <https://github.com/twisted/towncrier/issues/736>, [#741](https://github.com/twisted/towncrier/issues/741) <https://github.com/twisted/towncrier/issues/741>, [#747](https://github.com/twisted/towncrier/issues/747) <https://github.com/twisted/towncrier/issues/747>_

Changelog

Sourced from towncrier's changelog.

towncrier 26.9.0 (2026-09-04)

No significant changes since the previous release candidate.

Features

• towncrier build now support setting the date via the SOURCE_DATE_EPOCH specification. This adds support for Reproducible Builds. ([#746](https://github.com/twisted/towncrier/issues/746) <https://github.com/twisted/towncrier/issues/746>_)
• Wrapped line length can now be configured by setting wrap to an integer value greater than 0, using 79 by default if set to true. ([#464](https://github.com/twisted/towncrier/issues/464) <https://github.com/twisted/towncrier/issues/464>_)
• The towncrier create command line tool now has the --sub-issue option that is used when creating multiple fragments for the same issue number. ([#714](https://github.com/twisted/towncrier/issues/714) <https://github.com/twisted/towncrier/issues/714>_)

Bugfixes

• towncrier create now rejects fragment names whose issue identifier contains .. ([#733](https://github.com/twisted/towncrier/issues/733) <https://github.com/twisted/towncrier/issues/733>_)

Misc

• [#719](https://github.com/twisted/towncrier/issues/719) <https://github.com/twisted/towncrier/issues/719>, [#729](https://github.com/twisted/towncrier/issues/729) <https://github.com/twisted/towncrier/issues/729>, [#736](https://github.com/twisted/towncrier/issues/736) <https://github.com/twisted/towncrier/issues/736>, [#741](https://github.com/twisted/towncrier/issues/741) <https://github.com/twisted/towncrier/issues/741>, [#747](https://github.com/twisted/towncrier/issues/747) <https://github.com/twisted/towncrier/issues/747>_

Commits

• 12e95a9 Prepare final release.
• 7f5ef06 Initial commit.
• 1598380 #746 Reproducible build source date epoch (#749)
• b2df9f8 Merge branch 'trunk' into 746-reproducible-build-source-date-epoch
• dc07055 Update release for single line.
• 1e46459 docs: Clarify the defaults for build timestamp values.
• 803dbc5 Specify the precedence order for computing the build date.
• 434bf70 Show an example of 'SOURCE_DATE_EPOCH' in the Tutorial.
• 48f8b3d Document the 'SOURCE_DATE_EPOCH' behaviour for towncrier build.
• 9f899f5 Document the user-facing change in a Towncrier news fragment.
• Additional commits viewable in compare view