chore(testlib): Use JVM version restrictions to avoid failing tests

build.gradle

@@ -53,7 +53,7 @@ subprojects {
     javaVersions {
       target 11
       minimumToolchain 17
-      testWith(11, 17, 20)
+      testWith(11, 17, 21)
     }
 
     signWithKeyFromPrefixedProperties("kyori")

gradle/libs.versions.toml

@@ -8,10 +8,10 @@ gradlePluginPublish = "1.2.1"
 immutables = "2.10.1"
 indra = "3.1.3"
 jetbrainsAnnotations = "24.1.0"
-jgit = "6.10.0.+" # stay on 5.x series, 6+ requires Java 11
+jgit = "6.10.0.+"
 junit = "5.10.3"
 kotlin = "1.9.25"
-mammoth = "1.3.1"
+mammoth = "1.4.0"
 spotless = "6.21.0"
 
 [libraries]

indra-licenser-spotless/src/test/resources/net/kyori/indra/licenser/spotless/kotlin/in/build.gradle.kts

@@ -1,6 +1,6 @@
 plugins {
   id("net.kyori.indra.licenser.spotless")
-  kotlin("jvm") version "1.8.21"
+  kotlin("jvm") version "2.0.20"
 }
 
 kotlin {

indra-licenser-spotless/src/test/resources/net/kyori/indra/licenser/spotless/perLanguageFormat/in/build.gradle.kts

@@ -1,6 +1,6 @@
 plugins {
   id("net.kyori.indra.licenser.spotless")
-  kotlin("jvm") version "1.8.21"
+  kotlin("jvm") version "2.0.20"
 }
 
 kotlin {

indra-testlib/build.gradle

@@ -2,14 +2,6 @@ dependencies {
     api libs.mammoth.test
 }
 
-sourceSets {
-  main {
-    multirelease {
-      alternateVersions 20
-    }
-  }
-}
-
 javadoc {
     enabled = false
 }

indra-testlib/src/main/java/net/kyori/indra/test/IndraFunctionalTestBase.java

@@ -1,7 +1,7 @@
 /*
  * This file is part of indra, licensed under the MIT License.
  *
- * Copyright (c) 2020-2023 KyoriPowered
+ * Copyright (c) 2020-2024 KyoriPowered
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
@@ -37,9 +37,10 @@
  * A base annotation for both operations that use the configuration cache and those that don't.
  */
 @GradleFunctionalTest
-@LegacyGradleVersion
-@TestVariant(gradleVersion = "8.4")
-@TestVariantResource(value = "/injected-gradle-versions", optional = true)
+@TestVariant(gradleVersion = "7.6.4", maximumRuntimeVersion = 20)
+@TestVariant(gradleVersion = "8.9", maximumRuntimeVersion = 16)
+@TestVariant(gradleVersion = "8.10", minimumRuntimeVersion = 17)
+@TestVariantResource(value = "/injected-gradle-versions", optional = true, minimumRuntimeVersion = 17)
 @Tag("functional")
 @Documented
 @Retention(RetentionPolicy.RUNTIME)