Add cache dependency path

Author: smokestacklightnin

.github/workflows/cd-docs.yml

@@ -24,6 +24,8 @@ jobs:
         with:
           python-version: '3.10'
           cache: 'pip'
+          cache-dependency-path: |
+            tensorflow_serving/tools/pip_package/setup.py
 
       - name: Save time for cache for mkdocs
         run: echo "cache_id=$(date --utc '+%V')" >> $GITHUB_ENV