chore: Bump JDK from 17 to 21 (#57)

Author: Oliver Weiler

.github/workflows/ci.yml

@@ -21,7 +21,7 @@ jobs:
       - name: Set up Java
         uses: actions/setup-java@v3
         with:
-          distribution: temurin
+          distribution: zulu
           java-version: |
             8
             21

.github/workflows/release.yml

@@ -16,7 +16,7 @@ jobs:
       - name: Set up Java
         uses: actions/setup-java@v3
         with:
-          distribution: temurin
+          distribution: zulu
           java-version: |
             8
             21

pom.xml

@@ -134,7 +134,9 @@
                 <version>2.40.0</version>
                 <configuration>
                     <java>
-                        <palantirJavaFormat/>
+                        <palantirJavaFormat>
+                            <version>2.38.0</version>
+                        </palantirJavaFormat>
                     </java>
                     <pom>
                         <sortPom>