fix: update actions/cache to v4 to resolve deprecation warning

- Update actions/cache from deprecated v4.0.2 to v4.1.2
- Simplify other action references to use version tags

Author: thegdsks

.github/workflows/docs.yml

@@ -33,7 +33,7 @@ jobs:
           python-version: '3.11'
 
       - name: Cache pip dependencies
-        uses: actions/cache@0c45773b623bea8c8e75f6c82b208c3cf94ea4f9 # v4.0.2
+        uses: actions/cache@6849a6489940f00c2f30c0fb92c6274307ccb58a # v4.1.2
         with:
           path: ~/.cache/pip
           key: ${{ runner.os }}-pip-${{ hashFiles('requirements.txt') }}
@@ -49,10 +49,10 @@ jobs:
         run: mkdocs build --strict --verbose
 
       - name: Setup Pages
-        uses: actions/configure-pages@983d7736d9b0ae728b81ab479565c72886d7745b # v5.0.0
+        uses: actions/configure-pages@v5
 
       - name: Upload artifact
-        uses: actions/upload-pages-artifact@56afc609e74202658d3ffba0e8f6dda462b719fa # v3.0.1
+        uses: actions/upload-pages-artifact@v3
         with:
           path: './site'
 
@@ -66,4 +66,4 @@ jobs:
     steps:
       - name: Deploy to GitHub Pages
         id: deployment
-        uses: actions/deploy-pages@d6db90164ac5ed86f2b6aed7e0febac5b3c0c03e # v4.0.5
+        uses: actions/deploy-pages@v4