build with java 21

Author: rfresh2

.github/workflows/build.yml

@@ -18,7 +18,7 @@ jobs:
       - name: Setup JDK
         uses: actions/setup-java@v4
         with:
-          java-version: '23'
+          java-version: '21'
           distribution: 'temurin'
 
       - name: Elevate wrapper permissions

.github/workflows/publish.yml

@@ -15,7 +15,7 @@ jobs:
       - name: Setup JDK
         uses: actions/setup-java@v4
         with:
-          java-version: '23'
+          java-version: '21'
           distribution: 'temurin'
 
       - name: Elevate wrapper permissions

build.gradle.kts

@@ -5,7 +5,7 @@ plugins {
 group = properties["maven_group"] as String
 version = properties["plugin_version"] as String
 
-java { toolchain { languageVersion = JavaLanguageVersion.of(23) } }
+java { toolchain { languageVersion = JavaLanguageVersion.of(21) } }
 
 zenithProxy {
     mc = properties["mc"] as String