Update actions/checkout version to v4

Author: Fryguy

.github/workflows/ci.yaml

@@ -45,7 +45,7 @@ jobs:
       PGPASSWORD: smartvm
       CC_TEST_REPORTER_ID: "${{ secrets.CC_TEST_REPORTER_ID }}"
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Set up system
       run: bin/before_install
     - name: Set up Ruby

.github/workflows/cypress.yaml

@@ -39,7 +39,7 @@ jobs:
       PGHOST: localhost
       PGPASSWORD: smartvm
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Install Edge
       uses: browser-actions/setup-edge@v1
       if: ${{ matrix.cypress-browser == 'edge' }}