Pin actions/cache to full version number

Author: oddstr13

.github/workflows/build.yml

@@ -17,7 +17,7 @@ jobs:
         with:
           python-version: '3.10'
 
-      - uses: actions/cache@v4
+      - uses: actions/cache@v4.0.2
         with:
           path: ~/.cache/pip
           key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}