Update actions to latest versions.

Author: samcunliffe

Diff for: .github/workflows/docs.yml

@@ -17,9 +17,9 @@ jobs:
     name: Build & Upload Artifact
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
-      - uses: actions/setup-python@v3
+      - uses: actions/setup-python@v5
         with:
           python-version: "3.10"
 

Diff for: .github/workflows/test_and_deploy.yml

@@ -27,10 +27,10 @@ jobs:
         python-version: ['3.10', '3.11', '3.12']
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v3
+        uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}