update gradle actions

Replace gradle-build-action with setup-gradle as [suggested in
README][1]. Remove gradle-wrapper-validation since [setup-gradle
performs it][2]. Do not set up signing username/password in pre-merge
check because [external pull request actions do not have access to
repository secrets by default][3] and we don't want to change it.

[1]: https://github.com/gradle/gradle-build-action?tab=readme-ov-file
[2]: https://github.com/gradle/actions/blob/main/docs/setup-gradle.md#gradle-wrapper-validation
[3]: https://securitylab.github.com/resources/github-actions-preventing-pwn-requests/

.github/workflows/pre-merge.yml

@@ -13,32 +13,29 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout Repo
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
+      - name: Setup Gradle
+        uses: gradle/actions/setup-gradle@v4
       - name: Run tests
-        uses: gradle/gradle-build-action@v2
-        with:
-          arguments: test
+        run: ./gradlew test
   publish:
     name: Check that the publish plugin works
     runs-on: ubuntu-latest
     needs: [tests, lint]
     steps:
       - name: Checkout Repo
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
+      - name: Setup Gradle
+        uses: gradle/actions/setup-gradle@v4
       - name: Check that the publish plugin works
-        env:
-          ORG_GRADLE_PROJECT_signingKey: ${{ secrets.ORG_GRADLE_PROJECT_SIGNINGKEY }}
-          ORG_GRADLE_PROJECT_signingPassword: ${{ secrets.ORG_GRADLE_PROJECT_SIGNINGPASSWORD }}
-        uses: gradle/gradle-build-action@v2
-        with:
-          arguments: publishToMavenLocal
+        run: ./gradlew publishToMavenLocal
   lint:
     name: Check that the code is formatted
     runs-on: ubuntu-latest
     steps:
       - name: Checkout Repo
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
+      - name: Setup Gradle
+        uses: gradle/actions/setup-gradle@v4
       - name: Check that the code is formatted
-        uses: gradle/gradle-build-action@v2
-        with:
-          arguments: spotlessCheck
+        run: ./gradlew spotlessCheck

.github/workflows/publish.yml

@@ -8,15 +8,15 @@ jobs:
       - ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Set up JVM
         uses: actions/setup-java@v3
         with:
           distribution: 'zulu'
           java-version: '11'
           java-package: jdk
-      - name: Gradle Wrapper Validation
-        uses: gradle/[email protected]
+      - name: Setup Gradle
+        uses: gradle/actions/setup-gradle@v4
       - name: Publish to repository
         env:
           ORG_GRADLE_PROJECT_sonatypeUsername: ${{ secrets.ORG_GRADLE_PROJECT_SONATYPEUSERNAME }}