Update used GH actions, test on Python 3.12, and reenable PyPy

Signed-off-by: Stefan Marr <[email protected]>

.github/workflows/ci.yml

@@ -10,17 +10,17 @@ jobs:
       matrix:
         # Don't test pypy3.10, it currently is broken on GitHub Actions.
         # re-enable once PyYAML can be installed again. See #225
-        python-version: [ '3.7', '3.11' ]  # 'pypy3.10'
+        python-version: ["3.7", "3.12", "pypy3.10"]
         include:
           - python-version: 3.7
             coverage: "--cov=rebench"
     name: "Ubuntu-latest: Python ${{ matrix.python-version }}"
     steps:
       - name: Checkout ReBench
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Setup Python
-        uses: actions/setup-python@v4
+        uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}
           architecture: x64