Optimize CI a bit

Author: Goooler

.github/workflows/build.yml

@@ -9,12 +9,12 @@ jobs:
         runs-on: ubuntu-latest
 
         steps:
-          - uses: actions/checkout@v2
-          - name: Set up JDK 11
-            uses: actions/setup-java@v3
+          - uses: actions/checkout@v3
+          - uses: actions/setup-java@v3
             with:
               java-version: '11'
               distribution: 'zulu'
+          - uses: gradle/gradle-build-action@v2
           - name: Build and run unit tests with Gradle
             run: ./scripts/ci_unit.sh
           - name: Publish to Sonatype

.github/workflows/gradle-wrapper-validation.yml

@@ -6,5 +6,5 @@ jobs:
     name: "Validation"
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - uses: gradle/wrapper-validation-action@v1