Update actions jdk

Author: jpenilla

.github/workflows/build.yml

@@ -18,7 +18,7 @@ jobs:
         uses: actions/setup-java@v4
         with:
           distribution: 'temurin'
-          java-version: 17
+          java-version: 21
       - name: "setup gradle"
         uses: gradle/actions/setup-gradle@v4
       - name: "execute gradle build"

.gitignore

@@ -4,3 +4,4 @@
 build
 /test-plugin/run/
 /.idea/
+.kotlin/

buildSrc/src/main/kotlin/base-conventions.gradle.kts

@@ -13,9 +13,9 @@ if (project != rootProject) {
 
 indra {
   javaVersions {
-    minimumToolchain(17)
+    minimumToolchain(21)
     target(8)
-    testWith(8, 17)
+    testWith(8, 11, 17, 21)
   }
 }