Bump nox-poetry from 0.8.5 to 0.8.6 in /.github/workflows

Bumps [nox-poetry](https://github.com/cjolowicz/nox-poetry) from 0.8.5 to 0.8.6.
- [Release notes](https://github.com/cjolowicz/nox-poetry/releases)
- [Commits](cjolowicz/nox-poetry@v0.8.5...v0.8.6)

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

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

.github/workflows/constraints.txt

@@ -1,5 +1,5 @@
 pip==21.1.3
 nox==2020.12.31
-nox-poetry==0.8.5
+nox-poetry==0.8.6
 poetry==1.1.6
 virtualenv==20.4.7