Bump poetry from 1.1.14 to 1.1.15 in /.github/workflows (#189)

Bumps [poetry](https://github.com/python-poetry/poetry) from 1.1.14 to 1.1.15.
- [Release notes](https://github.com/python-poetry/poetry/releases)
- [Changelog](https://github.com/python-poetry/poetry/blob/1.1.15/CHANGELOG.md)
- [Commits](python-poetry/poetry@1.1.14...1.1.15)

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

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

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

.github/workflows/requirements.txt

@@ -1,2 +1,2 @@
 pip==22.2.2
-poetry==1.1.14
+poetry==1.1.15