Update JVM version for github actions/build to 21 as Gradle requires 17 minimum

Author: pdvrieze

.github/workflows/publish-snapshot.yml

@@ -20,10 +20,10 @@ jobs:
                     path: ~/.konan
                     key: ${{ runner.os }}-konan-${{ hashFiles('**/*.gradle*') }}-${{ hashFiles('**/gradle/wrapper/gradle-wrapper.properties') }}
                     restore-keys: ${{ runner.os }}-konan-
-            -   name: Set up JDK 11
+            -   name: Set up JDK 21
                 uses: actions/setup-java@v4
                 with:
-                    java-version: '11'
+                    java-version: '21'
                     distribution: 'temurin'
             -   id: cache-gradle-windows
                 name: Set up gradle

.github/workflows/upload_release.yml

@@ -20,10 +20,10 @@ jobs:
                     path: ~/.konan
                     key: ${{ runner.os }}-konan-${{ hashFiles('**/*.gradle*') }}-${{ hashFiles('**/gradle/wrapper/gradle-wrapper.properties') }}
                     restore-keys: ${{ runner.os }}-konan-
-            -   name: Set up JDK 11
+            -   name: Set up JDK 21
                 uses: actions/setup-java@v4
                 with:
-                    java-version: '11'
+                    java-version: '21'
                     distribution: 'temurin'
             -   id: cache-gradle-windows
                 name: Set up gradle