fix: correct labeler action version annotation

[rldyourmnd]

Scope

Correct the stale version annotation for the already pinned actions/labeler commit. The SHA is unchanged and resolves to the verified v6.2.0 release.

Validation

• actionlint passed for labeler.yml
• zizmor offline pedantic passed with no findings
• git diff --check passed
• No runtime, setup, JSON, secret, or development-only artifact changed
• No installer smoke is required for this comment-only workflow metadata correction

Release

• No release behavior changed; build and core-plugin versions remain unchanged
• No changelog entry is required for a corrected action annotation