Bump bump-my-version from 1.2.0 to 1.2.1 in /.github/workflows (TGSAI#580)

Bumps [bump-my-version](https://github.com/callowayproject/bump-my-version) from 1.2.0 to 1.2.1.
- [Release notes](https://github.com/callowayproject/bump-my-version/releases)
- [Changelog](https://github.com/callowayproject/bump-my-version/blob/master/CHANGELOG.md)
- [Commits](callowayproject/bump-my-version@v1.2...1.2.1)

---
updated-dependencies:
- dependency-name: bump-my-version
  dependency-version: 1.2.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Altay Sansal <[email protected]>

Author: dependabot[bot]

.github/workflows/constraints.txt

@@ -1,2 +1,2 @@
-bump-my-version==1.2.0
+bump-my-version==1.2.1
 nox==2025.5.1