chore: centralize and bump JDK version in libs.versions.toml

Also mark `26.1` as backwards compatible.

Author: Big-Iron-Cheems

build.gradle.kts

@@ -103,8 +103,9 @@ sourceSets {
 }
 
 java {
-    sourceCompatibility = JavaVersion.VERSION_25
-    targetCompatibility = JavaVersion.VERSION_25
+    toolchain {
+        languageVersion.set(JavaLanguageVersion.of(libs.versions.jdk.get().toInt()))
+    }
 
     if (System.getenv("CI")?.toBoolean() == true) {
         withSourcesJar()
@@ -147,6 +148,7 @@ tasks {
             "version" to project.version,
             "build_number" to buildNumber,
             "commit" to commit,
+            "jdk_version" to libs.versions.jdk.get(),
             "minecraft_version" to libs.versions.minecraft.get(),
             "loader_version" to libs.versions.fabric.loader.get()
         )

gradle/libs.versions.toml

@@ -1,5 +1,6 @@
 [versions]
 # Fabric (https://fabricmc.net/develop)
+jdk = "25"
 minecraft = "26.1.1"
 fabric-loader = "0.18.6"
 fabric-api = "0.145.2+26.1.1"

src/main/resources/fabric.mod.json

@@ -49,8 +49,11 @@
     }
   },
   "depends": {
-    "java": ">=25",
-    "minecraft": ["${minecraft_version}"],
+    "java": ">=${jdk_version}",
+    "minecraft": [
+      "26.1",
+      "${minecraft_version}"
+    ],
     "fabricloader": ">=${loader_version}"
   },
   "breaks": {