Update poetry

Author: jakubno

.github/workflows/release.yml

@@ -114,7 +114,7 @@ jobs:
       - name: Install and configure Poetry
         uses: snok/install-poetry@v1
         with:
-          version: 1.5.1
+          version: 1.8.1
           virtualenvs-create: true
           virtualenvs-in-project: true
           installer-parallel: true

.github/workflows/release_candidates.yml

@@ -57,7 +57,7 @@ jobs:
         uses: snok/install-poetry@v1
         if: ${{ contains( github.event.pull_request.labels.*.name, 'python-rc') }}
         with:
-          version: 1.5.1
+          version: 1.8.1
           virtualenvs-create: true
           virtualenvs-in-project: true
           installer-parallel: true