Test bot needs java 21

Author: duncte123

.github/workflows/build-prs.yml

@@ -17,7 +17,7 @@ jobs:
       - name: Set up JDK 17
         uses: actions/setup-java@v3
         with:
-          java-version: 17
+          java-version: 21
           distribution: zulu
           cache: gradle
       - name: Grant execute permission for gradlew

.github/workflows/build.yml

@@ -38,7 +38,7 @@ jobs:
           uses: actions/setup-java@v3
           with:
             distribution: zulu
-            java-version: 17
+            java-version: 21
             cache: gradle
 
       -   name: Setup Gradle

.github/workflows/docs-branch.yml

@@ -24,7 +24,7 @@ jobs:
                   fetch-depth: 0
             - uses: actions/setup-java@v4
               with:
-                  java-version: 17
+                  java-version: 21
                   distribution: zulu
                   cache: gradle
             -   name: Build docs

.github/workflows/docs-pr.yml

@@ -25,7 +25,7 @@ jobs:
                   fetch-depth: 0
             - uses: actions/setup-java@v4
               with:
-                java-version: 17
+                java-version: 21
                 distribution: zulu
                 cache: gradle
             -   name: Build docs

.github/workflows/docs.yml

@@ -21,7 +21,7 @@ jobs:
                   fetch-depth: 0
             - uses: actions/setup-java@v4
               with:
-                  java-version: 17
+                  java-version: 21
                   distribution: zulu
                   cache: gradle
             -   name: Build docs