Update some build tooling

Mostly now use JDK 25 to build, to allow us to use markdown docstrings
in the future — this makes the javadoc generator *much* simpler.

Author: SquidDev

.github/workflows/main-ci.yml

@@ -14,7 +14,7 @@ jobs:
     - name: 📥 Set up Java
       uses: actions/setup-java@v4
       with:
-        java-version: 21
+        java-version: 25
         distribution: 'temurin'
 
     - name: 📥 Setup Gradle
@@ -87,7 +87,7 @@ jobs:
     - name: 📥 Set up Java
       uses: actions/setup-java@v4
       with:
-        java-version: 21
+        java-version: 25
         distribution: 'temurin'
 
     - name: 📥 Setup Gradle

.github/workflows/make-doc.yml

@@ -17,7 +17,7 @@ jobs:
     - name: 📥 Set up Java
       uses: actions/setup-java@v4
       with:
-        java-version: 21
+        java-version: 25
         distribution: 'temurin'
 
     - name: 📥 Setup Gradle

CONTRIBUTING.md

@@ -28,7 +28,7 @@ Translations are managed through [CrowdIn], an online interface for managing lan
 In order to develop CC: Tweaked, you'll need to download the source code and then run it.
 
  - Make sure you've got the following software installed:
-   - Java Development Kit 21 (JDK). This can be downloaded from [Adoptium].
+   - Java Development Kit 25 (JDK). This can be downloaded from [Adoptium].
    - [Git](https://git-scm.com/).
    - [NodeJS 20 or later][node].
 
@@ -101,7 +101,7 @@ about how you can build on that until you've covered everything!
 
 [new-issue]: https://github.com/cc-tweaked/CC-Tweaked/issues/new/choose "Create a new issue"
 [community]: README.md#community "Get in touch with the community."
-[Adoptium]: https://adoptium.net/temurin/releases?version=21 "Download OpenJDK 21"
+[Adoptium]: https://adoptium.net/temurin/releases?version=25 "Download OpenJDK 25"
 [illuaminate]: https://github.com/SquidDev/illuaminate/ "Illuaminate on GitHub"
 [docs]: https://tweaked.cc/ "CC: Tweaked documentation"
 [ldoc]: http://stevedonovan.github.io/ldoc/ "ldoc, a Lua documentation generator."

buildSrc/src/main/kotlin/cc/tweaked/gradle/CCTweakedPlugin.kt

@@ -45,9 +45,9 @@ class CCTweakedPlugin : Plugin<Project> {
 
     companion object {
         /**
-         * The version we run with. We use Java 21 here, as our Gradle build requires that.
+         * The version we run with. We use Java 25 here, as our Gradle build requires that.
          */
-        val JDK_VERSION = JavaLanguageVersion.of(21)
+        val JDK_VERSION = JavaLanguageVersion.of(25)
 
         /**
          * The Java version we target. Should be the same as what Minecraft uses.

gradle/gradle-daemon-jvm.properties

@@ -1,2 +1,2 @@
 #This file is generated by updateDaemonJvm
-toolchainVersion=21
+toolchainVersion=25

gradle/libs.versions.toml

@@ -31,7 +31,7 @@ commonsCli = "1.10.0"
 jetbrainsAnnotations = "26.0.2-1"
 jspecify = "1.0.0"
 jzlib = "1.1.3"
-kotlin = "2.2.21"
+kotlin = "2.3.0"
 kotlin-coroutines = "1.10.2"
 nightConfig = "3.8.3"
 
@@ -61,14 +61,14 @@ cctJavadoc = "1.8.5"
 checkstyle = "12.1.1"
 errorProne-core = "2.45.0"
 errorProne-plugin = "4.3.0"
-fabric-loom = "1.14.5"
+fabric-loom = "1.15.2"
 githubRelease = "2.5.2"
 gradleVersions = "0.53.0"
 ideaExt = "1.3"
 illuaminate = "0.1.0-83-g1131f68"
 lwjgl = "3.3.6"
 minotaur = "2.8.7"
-modDevGradle = "2.0.124"
+modDevGradle = "2.0.140"
 nullAway = "0.12.11"
 shadow = "9.2.2"
 spotless = "8.0.0"

gradle/wrapper/gradle-wrapper.jar

@@ -1,6 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-9.2.0-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.3.0-bin.zip
 networkTimeout=10000
 validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME