Upgrading to anton-yurchenko/git-release>=4.0.0 requires a date in each changelog entry

[asjohnston-asf]

We're using anton-yurchenko/git-release@v3.5.0 in reusable-release.yml, dated 2021-05-01. v4.0.0 updated the changelog parser to require a date in the changelog entry title. For example:

## [0.1.0] fails with FATAL error reading changelog: changelog file does not contain version 0.1.0
## [0.1.0] - 2024-10-25 succeeds

See the regex at https://github.com/anton-yurchenko/go-changelog/blob/main/constants.go#L14