Update checkout action to v4

.github/workflows/push-build-deploy.yml

@@ -15,18 +15,22 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v2
+    - name: Checkout repository
+      uses: actions/checkout@v4
+
     - name: Set up JDK 1.8
       uses: actions/setup-java@v1
       with:
         java-version: 1.8
+
     - name: Build with Gradle
       uses: eskatos/gradle-command-action@v1.3.1
       with:
         arguments: clean build installDist
         wrapper-cache-enabled: true
         dependencies-cache-enabled: true
         configuration-cache-enabled: true
+
     - name: Deploy
       uses: mojira/deploy@main
       with:
@@ -48,4 +52,3 @@ jobs:
           sleep 1
           cd r-isa
           /usr/bin/screen -d -m bash -c '/home/risa/r-isa/bin/risa; exec sh'
-