chore(ci): update docs workflow

Author: absadiki

.github/workflows/docs.yml

@@ -1,4 +1,4 @@
-name: ci
+name: docs
 on:
   push:
     branches:
@@ -9,17 +9,14 @@ jobs:
   deploy:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
-      - uses: actions/setup-python@v4
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
         with:
-          python-version: 3.x
-      - uses: actions/cache@v2
+          python-version: '3.x'
+      - uses: actions/cache@v4
         with:
-          key: ${{ github.ref }}
-          path: .cache
-      - run: pip install mkdocs-macros-plugin
-      - run: pip install mkdocs-material
-      - run: pip install mkdocstrings[python]
-      - run: pip install black
-      - run: pip install pywhispercpp
+          key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}
+          path: ~/.cache/pip
+      - run: |
+          pip install mkdocs-macros-plugin mkdocs-material mkdocstrings[python] black pywhispercpp
       - run: mkdocs gh-deploy --force