Bump action and OS versions in CI (#123)

Author: jamt9000

.github/workflows/ci-testing.yml

@@ -19,14 +19,14 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-20.04, macos-latest, windows-2019]
+        os: [ubuntu-24.04, macos-latest, windows-2025]
         python-version: ['3.11']
 
     # Timeout: https://stackoverflow.com/a/59076067/4521646
     timeout-minutes: 35
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v2
       with:
@@ -46,7 +46,7 @@ jobs:
         python -c "from pip._internal.locations import USER_CACHE_DIR; print('::set-output name=dir::' + USER_CACHE_DIR)"
 
     - name: Cache pip
-      uses: actions/cache@v2
+      uses: actions/cache@v4
       with:
         path: ${{ steps.pip-cache.outputs.dir }}
         key: ${{ runner.os }}-py${{ matrix.python-version }}-${{ hashFiles('requirements.txt') }}