build: Update actions/cache version

Author: roda82

.github/workflows/ci.yml

@@ -1,10 +1,10 @@
-name: ci 
+name: ci
 
 
 on:
   push:
     branches:
-      - master 
+      - master
 
 permissions:
   contents: write
@@ -16,11 +16,11 @@ jobs:
       - uses: actions/setup-python@v4
         with:
           python-version: 3.x
-      - uses: actions/cache@v2
+      - uses: actions/cache@v3
         with:
           key: ${{ github.ref }}
           path: .cache
-      - run: pip install mkdocs-material mkdocs-material-extensions 
+      - run: pip install mkdocs-material mkdocs-material-extensions
 
 
       - run: mkdocs gh-deploy --force