Drop java 11, bump GraalVM to 23.0 (#439)

* Remove unnecessary strictfp modifier
* Add annotations to address Truffle DSL warnings (@Idempotent, @Exclusive)
* Adjust build logic to allow building cross-arch on macOS
* Add warning suppression for specialization limit (left this one as a TODO)

buildSrc/src/main/kotlin/pklJavaLibrary.gradle.kts

@@ -61,4 +61,7 @@ val workAroundKotlinGradlePluginBug by tasks.registering {
 
 tasks.compileJava {
   dependsOn(workAroundKotlinGradlePluginBug)
+  // TODO: determine correct limits for Truffle specializations
+  // (see https://graalvm.slack.com/archives/CNQSB2DHD/p1712380902746829)
+  options.compilerArgs.add("-Atruffle.dsl.SuppressWarnings=truffle-limit")
 }