Bump poetry from 1.1.4 to 1.1.5 in /.github/workflows (#798)

Bumps [poetry](https://github.com/python-poetry/poetry) from 1.1.4 to 1.1.5.
- [Release notes](https://github.com/python-poetry/poetry/releases)
- [Changelog](https://github.com/python-poetry/poetry/blob/1.1.5/CHANGELOG.md)
- [Commits](python-poetry/poetry@1.1.4...1.1.5)

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

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

.github/workflows/constraints.txt

@@ -2,6 +2,6 @@ pip==21.0.1
 cookiecutter==1.7.2
 nox==2020.12.31
 nox-poetry==0.8.1
-poetry==1.1.4
+poetry==1.1.5
 pre-commit==2.10.1
 virtualenv==20.4.2