Update to Java 21 (#69)

This removes the `ZipFileSystem.exists` hack and implements
`FileSystemProvider.readAttributesIfExists` and
`FileSystemProvider.exists`. While I was working on this, I also
improved the #63 optimization in `readAttributes` by passing already
known attributes.

Author: Gaming32

.github/workflows/build-prs.yml

@@ -16,5 +16,5 @@ jobs:
   build:
     uses: neoforged/actions/.github/workflows/build-prs.yml@main
     with:
-      java: 17
+      java: 21
       gradle_tasks: test

.github/workflows/release.yml

@@ -12,9 +12,9 @@ jobs:
   release:
     uses: neoforged/actions/.github/workflows/gradle-publish.yml@main
     with:
-      java: 17
+      java: 21
       pre_gradle_tasks: test
-      gradle_tasks: publish 
+      gradle_tasks: publish
     secrets:
       DISCORD_WEBHOOK: ${{ secrets.DISCORD_WEBHOOK }}
       MAVEN_USER: ${{ secrets.MAVEN_USER }}

build.gradle

@@ -20,7 +20,7 @@ allprojects {
 
     group 'cpw.mods'
     java {
-        toolchain.languageVersion = JavaLanguageVersion.of(17)
+        toolchain.languageVersion = JavaLanguageVersion.of(project.java_version)
         modularity.inferModulePath.set(true)
     }
     version = gradleutils.version

gradle.properties

@@ -1,2 +1,3 @@
+java_version=21
 asm_version=9.3
 jb_annotations_version=22.0.0

gradle/wrapper/gradle-wrapper.jar

@@ -1,5 +1,7 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.2-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.7-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists

gradle/wrapper/gradle-wrapper.properties

@@ -21,7 +21,7 @@ dependencies {
 
 task jmh(type: JavaExec, dependsOn: sourceSets.main.output) {
     javaLauncher = javaToolchains.launcherFor {
-        languageVersion = JavaLanguageVersion.of(17)
+        languageVersion = JavaLanguageVersion.of(project.java_version)
     }
     jvmArgs= [
         '-p', sourceSets.main.runtimeClasspath.asPath,