ci: update Python matrix and add macOS ARM64 runner

- Drop EOL Python versions (3.7, 3.8, 3.9)
- Add Python 3.12, 3.13, 3.14
- Add macos-latest (ARM64) to OS matrix
- Update actions/checkout to v4 and actions/setup-python to v5

Author: jvkersch

.github/workflows/run-unittests.yml

@@ -9,16 +9,17 @@ on:
 jobs:
   build:
 
-    runs-on: ubuntu-latest
+    runs-on: ${{ matrix.os }}
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11"]
+        os: [ubuntu-latest, macos-latest]
+        python-version: ["3.10", "3.11", "3.12", "3.13", "3.14"]
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v2
+      uses: actions/setup-python@v5
       with:
         python-version: ${{ matrix.python-version }}
     - name: Install package