build(gradle): Build with Java 21

As fcfab20 decoupled the Java version to use for analysis of Gradle
projects from the Java version running ORT, finally update the Java
version from 11 / 17 to 21. See [1] for context.

[1]: #8249

Signed-off-by: Sebastian Schuberth <sebastian@doubleopen.org>

docker/versions.dockerfile

@@ -10,7 +10,7 @@ ARG DART_VERSION=2.18.4
 ARG DOTNET_VERSION=6.0
 ARG GO_VERSION=1.23.0
 ARG HASKELL_STACK_VERSION=2.13.1
-ARG JAVA_VERSION=17
+ARG JAVA_VERSION=21
 ARG LICENSEE_VERSION=9.15.3
 ARG NODEJS_VERSION=20.14.0
 ARG NPM_VERSION=10.8.3

gradle.properties

@@ -24,7 +24,7 @@ org.gradle.parallel = true
 kotlin.code.style = official
 
 # The version of the JDK to use for building ORT.
-javaLanguageVersion = 11
+javaLanguageVersion = 21
 
 # The version of the SPDX license list which is used to import license texts and generate SPDX enums. Must be a valid
 # tag, see https://github.com/spdx/license-list-data/tags.

plugins/scanners/scanoss/src/main/kotlin/ScanOss.kt

@@ -98,7 +98,7 @@ class ScanOss internal constructor(
         val result = service.scan(
             wfpString,
             context.labels["scanOssContext"],
-            context.labels["scanOssId"]?.toIntOrNull() ?: Thread.currentThread().id.toInt()
+            context.labels["scanOssId"]?.toIntOrNull() ?: Thread.currentThread().threadId().toInt()
         )
 
         // Replace the anonymized UUIDs by their file paths.