fix(ci): sync Flatpak Gradle distribution

[simulationstation]

Summary

Keep the offline Flatpak manifest's bundled Gradle distribution in sync with the checked-in wrapper:

• use gradle-9.6.1-bin.zip
• use the wrapper's 9c0f…e14 SHA-256

Root cause

#6611 pinned the repository wrapper back from Gradle 9.7.0 to 9.6.1, but scripts/verify-flatpak/desktop-offline.yaml still downloaded the 9.7.0 binary.

The Flatpak build rewrites distributionUrl to that bundled ZIP while retaining distributionSha256Sum from gradle-wrapper.properties. Both architectures therefore fail before project compilation:

Expected checksum: 9c0f7fae...32c9e14
Actual checksum:   84fbba45...d873ae

This surfaced in the Flatpak checks on #6624 and is independent of that PR's messaging changes.

Validation

• parsed the wrapper properties and Flatpak manifest and asserted exact URL/SHA equality
• git diff --check
• the existing x86_64 and aarch64 Flatpak workflow provides the end-to-end offline build check

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📥 Commits

Reviewing files that changed from the base of the PR and between a22bf5e and f5d307b.

📒 Files selected for processing (1)

• scripts/verify-flatpak/desktop-offline.yaml

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