chore(CI): don't pin core github actions

Author: stipsan

.github/workflows/prettier.yml

@@ -21,7 +21,7 @@ jobs:
           cache: npm
           node-version: lts/*
       - run: npm ci --ignore-scripts --only-dev
-      - uses: actions/cache@6998d139ddd3e68c71e9e398d8e40b71a2f39812 # v3
+      - uses: actions/cache@v3
         with:
           path: node_modules/.cache/prettier/.prettier-cache
           key: prettier-${{ hashFiles('package-lock.json') }}-${{ hashFiles('.gitignore') }}