ci: Bump poetry from 1.7.1 to 1.8.1 in /.github/workflows

Bumps [poetry](https://github.com/python-poetry/poetry) from 1.7.1 to 1.8.1.
- [Release notes](https://github.com/python-poetry/poetry/releases)
- [Changelog](https://github.com/python-poetry/poetry/blob/main/CHANGELOG.md)
- [Commits](python-poetry/poetry@1.7.1...1.8.1)

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

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/constraints.txt

@@ -1,4 +1,4 @@
 nox==2023.4.22
 nox-poetry==1.0.3
 pip==23.3.2
-poetry==1.7.1
+poetry==1.8.1