ci: bump poetry from 1.8.5 to 2.1.2 in /.github/workflows

Bumps [poetry](https://github.com/python-poetry/poetry) from 1.8.5 to 2.1.2.
- [Release notes](https://github.com/python-poetry/poetry/releases)
- [Changelog](https://github.com/python-poetry/poetry/blob/main/CHANGELOG.md)
- [Commits](python-poetry/poetry@1.8.5...2.1.2)

---
updated-dependencies:
- dependency-name: poetry
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/constraints.txt

@@ -1,7 +1,7 @@
 pip==24.3.1
 nox==2024.10.9
 nox-poetry==1.2.0
-poetry==1.8.5
+poetry==2.1.2
 virtualenv==20.29.3
 poetry-dynamic-versioning==1.8.2
 toml==0.10.2