GitHub actions: Upgrade setup-poetry action to v8

v7 currently fails with HTTP 404.

Author: jherland

.github/workflows/format.yaml

@@ -17,7 +17,7 @@ jobs:
         uses: actions/setup-python@v4
         with:
           python-version: ${{ matrix.python-version }}
-      - uses: Gr1N/setup-poetry@v7
+      - uses: Gr1N/setup-poetry@v8
       - uses: actions/cache@v2
         with:
           path: ~/.cache/pypoetry/virtualenvs

.github/workflows/lint.yaml

@@ -17,7 +17,7 @@ jobs:
         uses: actions/setup-python@v4
         with:
           python-version: ${{ matrix.python-version }}
-      - uses: Gr1N/setup-poetry@v7
+      - uses: Gr1N/setup-poetry@v8
       - uses: actions/cache@v2
         with:
           path: ~/.cache/pypoetry/virtualenvs

.github/workflows/publish.yaml

@@ -14,7 +14,7 @@ jobs:
     steps:
       - uses: actions/checkout@v3
       - uses: actions/setup-python@v4
-      - uses: Gr1N/setup-poetry@v7
+      - uses: Gr1N/setup-poetry@v8
       - name: Configure access
         run: |
           poetry config repositories.testpypi https://test.pypi.org/legacy/

.github/workflows/tests.yaml

@@ -17,7 +17,7 @@ jobs:
         uses: actions/setup-python@v4
         with:
           python-version: ${{ matrix.python-version }}
-      - uses: Gr1N/setup-poetry@v7
+      - uses: Gr1N/setup-poetry@v8
       - uses: actions/cache@v2
         with:
           path: |