Bump poetry from 1.1.1 to 1.1.2 in /.github/workflows (#129)

Bumps [poetry](https://github.com/python-poetry/poetry) from 1.1.1 to 1.1.2.
- [Release notes](https://github.com/python-poetry/poetry/releases)
- [Changelog](https://github.com/python-poetry/poetry/blob/1.1.2/CHANGELOG.md)
- [Commits](python-poetry/poetry@1.1.1...1.1.2)

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.github/workflows/constraints.txt

@@ -1,4 +1,4 @@
 pip==20.2.3
 nox==2020.8.22
-poetry==1.1.1
+poetry==1.1.2
 virtualenv==20.0.33