Gradle 8.2 is not compatible with Java 21

[sdavids]

https://docs.gradle.org/8.4/release-notes.html#java-21

Java 21 is now supported for compiling, testing, and running such projects.

https://docs.gradle.org/8.5/release-notes.html#java-21

Gradle now supports running on Java 21.

Update compatability to java 21

adr-j/gradle/wrapper/gradle-wrapper.properties

Line 3 in 0e9f390

distributionUrl=https\://services.gradle.org/distributions/gradle-8.2-bin.zip

adr-j/build.gradle

Lines 16 to 17 in 0e9f390

	sourceCompatibility = JavaVersion.VERSION_21
	targetCompatibility = JavaVersion.VERSION_21

[sdavids]

Current version is 8.10.

If you want to migrate to Kotlin-DSL also: I could help with that.

[adoble]

Kotlin-DSL does seem to be the better alternative. If you could help with the migration that would be great.

[sdavids]

#56