CI: don't restrict Python version

Author: mgeier

.github/workflows/main.yml

@@ -8,15 +8,11 @@ jobs:
       matrix:
         include:
         - os: ubuntu-latest
-          python-version: "3.10"
           jack: jackd2
         - os: ubuntu-latest
-          python-version: "3.10"
           jack: jackd1
         - os: macos-latest
-          python-version: "3.10"
         - os: windows-latest
-          python-version: "3.10"
     runs-on: ${{ matrix.os }}
     steps:
     - name: Install JACK on Ubuntu
@@ -42,14 +38,14 @@ jobs:
       shell: bash
       run: |
         jackd --no-realtime -d dummy &
-    - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v1
+    - name: Set up Python
+      uses: actions/setup-python@v4
       with:
-        python-version: ${{ matrix.python-version }}
+        python-version: "3"
     - name: Double-check Python version
       run: |
         python --version
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - name: Install Python package
       run: |
         python -m pip install .
@@ -64,13 +60,13 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Set up Python
-      uses: actions/setup-python@v1
+      uses: actions/setup-python@v4
       with:
-        python-version: "3.10"
+        python-version: "3"
     - name: Double-check Python version
       run: |
         python --version
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
       with:
         fetch-depth: 0
     - name: Install doc dependencies