Update actions/setup-python action to v5

Author: renovate[bot]

.github/workflows/release-package.yml

@@ -20,7 +20,7 @@ jobs:
     steps:
     - uses: actions/checkout@v3
     - name: Set up Python
-      uses: actions/setup-python@v4
+      uses: actions/setup-python@v5
       with:
         python-version: '3.9'
 

.github/workflows/testing.yml

@@ -22,7 +22,7 @@ jobs:
     - uses: actions/checkout@v3
 
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v3
+      uses: actions/setup-python@v5
       with:
         python-version: ${{ matrix.python-version }}
     ## See https://github.com/snok/install-poetry