Release as java 21

Signed-off-by: Alexander Brandes <mc.cache@web.de>

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -27,7 +27,7 @@ body:
       description: Which server version are you using? If your server version is not listed, it is not supported. Update to a supported version first.
       multiple: false
       options:
-        - '1.21.3'
+        - '1.21.4'
         - '1.21.1'
         - '1.20.6'
         - '1.20.4'

build.gradle.kts

@@ -89,10 +89,6 @@ subprojects {
         }
     }
 
-    tasks.compileJava.configure {
-        options.release.set(17)
-    }
-
     configurations.all {
         attributes.attribute(TargetJvmVersion.TARGET_JVM_VERSION_ATTRIBUTE, 21)
     }
@@ -230,7 +226,7 @@ tasks.getByName<Jar>("jar") {
     enabled = false
 }
 
-val supportedVersions = listOf("1.18.2", "1.19.4", "1.20.6", "1.21.1", "1.21.3")
+val supportedVersions = listOf("1.18.2", "1.19.4", "1.20.6", "1.21.1", "1.21.4")
 tasks {
     register("cacheLatestFaweArtifact") {
         val lastSuccessfulBuildUrl = uri("https://ci.athion.net/job/FastAsyncWorldEdit/lastSuccessfulBuild/api/json").toURL()