Update GitHub Actions Java version to Java 21 (from Java 17)

Author: JorelAli

.github/workflows/build.yml

@@ -15,7 +15,7 @@ jobs:
       matrix:
         # Use these Java versions
         java: [
-          17,    # Current Java LTS & minimum supported by Minecraft
+          21,    # Current Java LTS & minimum supported by Minecraft
         ]
         # and run on both Linux and Windows
         # os: [ubuntu-20.04, windows-2022]
@@ -29,7 +29,7 @@ jobs:
         uses: actions/checkout@v3
 
       - name: Setup JDK ${{ matrix.java }}
-        uses: actions/setup-java@v3
+        uses: actions/setup-java@v4
         with:
           distribution: temurin
           java-version: ${{ matrix.java }}
@@ -131,7 +131,7 @@ jobs:
       ### Upload .jar artifacts ###
 
       - name: Upload CommandAPI (Bukkit) plugin artifact
-        if: ${{ runner.os == 'Linux' && matrix.java == '17' }} # Only upload artifacts built from latest java on one OS
+        if: ${{ runner.os == 'Linux' && matrix.java == '21' }} # Only upload artifacts built from latest java on one OS
         uses: actions/upload-artifact@v3
         with:
           name: CommandAPI (Bukkit plugin)
@@ -141,7 +141,7 @@ jobs:
             !commandapi-platforms/commandapi-bukkit/commandapi-bukkit-plugin/target/*javadoc.jar
 
       - name: Upload CommandAPI (Velocity) plugin artifact
-        if: ${{ runner.os == 'Linux' && matrix.java == '17' }} # Only upload artifacts built from latest java on one OS
+        if: ${{ runner.os == 'Linux' && matrix.java == '21' }} # Only upload artifacts built from latest java on one OS
         uses: actions/upload-artifact@v3
         with:
           name: CommandAPI (Velocity plugin)
@@ -157,10 +157,10 @@ jobs:
 
       ### Save PR information for 'SonarAnalyze'
       - name: Save PR number to file
-        if: github.event_name == 'pull_request' && ${{ matrix.os }} == 'ubuntu-latest' && ${{ matrix.java_version }} == '17'
+        if: github.event_name == 'pull_request' && ${{ matrix.os }} == 'ubuntu-latest' && ${{ matrix.java_version }} == '21'
         run: echo ${{ github.event.number }} > PR_NUMBER.txt
       - name: Archive PR number
-        if: github.event_name == 'pull_request' && ${{ matrix.os }} == 'ubuntu-latest' && ${{ matrix.java_version }} == '17'
+        if: github.event_name == 'pull_request' && ${{ matrix.os }} == 'ubuntu-latest' && ${{ matrix.java_version }} == '21'
         uses: actions/upload-artifact@v3
         with:
             name: PR_NUMBER
@@ -175,14 +175,14 @@ jobs:
       - name: Checkout the CommandAPI repository
         uses: actions/checkout@v3
 
-      - name: Setup JDK 17
-        uses: actions/setup-java@v3
+      - name: Setup JDK 21
+        uses: actions/setup-java@v4
         with:
           distribution: temurin
           server-id: ossrh # Needs to match the id in the main pom.xml file
           server-username: MAVEN_USERNAME
           server-password: MAVEN_PASSWORD
-          java-version: 17
+          java-version: 21
           cache: maven
 
       - name: Deploy snapshot version of the CommandAPI (Bukkit+Velocity) to the Sonatype snapshot repository

.github/workflows/sonar.yml

@@ -66,11 +66,11 @@ jobs:
                   echo "PR targets $branchTarget"
                   echo "sonar.branch.target=$branchTarget" >> $GITHUB_ENV
 
-            - name: Setup JDK 17
-              uses: actions/setup-java@v3
+            - name: Setup JDK 21
+              uses: actions/setup-java@v4
               with:
                   distribution: temurin
-                  java-version: 17
+                  java-version: 21
                   cache: maven
 
             - name: Cache SonarCloud packages