Add rewrite-java-21

Fixes openrewrite/rewrite#4534

.github/workflows/bump-snapshots.yml

@@ -17,7 +17,7 @@ jobs:
       - uses: actions/setup-java@v4
         with:
           distribution: temurin
-          java-version: 17
+          java-version: 21
           cache: maven
           server-id: ossrh
           settings-path: ${{ github.workspace }}

.github/workflows/ci.yml

@@ -23,7 +23,7 @@ jobs:
       - uses: actions/setup-java@v4
         with:
           distribution: temurin
-          java-version: 17
+          java-version: 21
           cache: maven
           server-id: ossrh
           settings-path: ${{ github.workspace }}

.github/workflows/pages.yml

@@ -35,7 +35,7 @@ jobs:
       - uses: actions/setup-java@v4
         with:
           distribution: temurin
-          java-version: 17
+          java-version: 21
           cache: maven
       - name: site
         run: ./mvnw --show-version --no-transfer-progress --update-snapshots clean site --file=pom.xml --fail-at-end --batch-mode -Dstyle.color=always -Ddependency-check.skip=true

.github/workflows/publish.yml

@@ -15,7 +15,7 @@ jobs:
       - uses: actions/setup-java@v4
         with:
           distribution: temurin
-          java-version: 17
+          java-version: 21
           cache: maven
           server-id: ossrh
           settings-path: ${{ github.workspace }}

.sdkmanrc

@@ -1,3 +1,3 @@
 # Enable auto-env through the sdkman_auto_env config
 # Add key=value pairs of SDKs to use below
-java=17.0.12-tem
+java=21.0.4-tem

pom.xml

@@ -177,6 +177,10 @@
             <groupId>org.openrewrite</groupId>
             <artifactId>rewrite-java-17</artifactId>
         </dependency>
+        <dependency>
+            <groupId>org.openrewrite</groupId>
+            <artifactId>rewrite-java-21</artifactId>
+        </dependency>
         <dependency>
             <groupId>org.openrewrite</groupId>
             <artifactId>rewrite-xml</artifactId>