Update actions/cache action to v4

Author: renovate[bot]

.github/workflows/shipjs-trigger.yml

@@ -19,7 +19,7 @@ jobs:
       - name: Get yarn cache
         id: yarn-cache
         run: echo "::set-output name=dir::$(yarn cache dir)"
-      - uses: actions/cache@v2.1.8
+      - uses: actions/cache@v4.0.0
         with:
           path: ${{ steps.yarn-cache.outputs.dir }}
           key: ${{ runner.os }}-yarn-${{ hashFiles('**/yarn.lock') }}