Upgrade actions that use deprecated features

Author: snicoll

Diff for: .github/workflows/backport-bot.yml

@@ -18,11 +18,13 @@ jobs:
       pull-requests: write
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
-      - uses: actions/setup-java@v3
+      - name: Check out code
+        uses: actions/checkout@v4
+      - name: Set up Java
+        uses: actions/setup-java@v4
         with:
-          distribution: 'temurin'
-          java-version: '17'
+          distribution: 'liberica'
+          java-version: 17
       - name: Download BackportBot
         run: wget https://github.com/spring-io/backport-bot/releases/download/latest/backport-bot-0.0.1-SNAPSHOT.jar
       - name: Backport

Diff for: .github/workflows/gradle-wrapper-validation.yml

@@ -9,5 +9,5 @@ jobs:
     name: "Validation"
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
-      - uses: gradle/wrapper-validation-action@v1
+      - uses: actions/checkout@v4
+      - uses: gradle/wrapper-validation-action@v2