Update GitHub actions

Author: mwilliamson

.github/workflows/tests.yml

@@ -12,10 +12,10 @@ jobs:
 
         steps:
 
-        - uses: actions/checkout@v3
+        - uses: actions/checkout@v4
 
         - name: Use Python ${{ matrix.python-version }}
-          uses: actions/setup-python@v4
+          uses: actions/setup-python@v5
           with:
               python-version: ${{ matrix.python-version }}