ci: bump actions/checkout to v4

.github/workflows/analyze.yml

@@ -22,7 +22,7 @@ jobs:
     name: "Static analysis & format check"
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Setup Flutter
         uses: subosito/flutter-action@v2
         with:

.github/workflows/pr-build.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           # Make sure the release step uses its own credentials:
           # https://github.com/cycjimmy/semantic-release-action#private-packages

.github/workflows/release-build.yml

@@ -9,7 +9,7 @@ jobs:
   release:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Set env
         run: echo "RELEASE_VERSION=${GITHUB_REF#refs/*/}" >> $GITHUB_ENV
       - name: Set up JDK 11