dependency: Update actions/setup-java action to v6

.github/workflows/gradle.yml

@@ -18,7 +18,7 @@ jobs:
           fetch-depth: 0
 
       - name: Set up JDK 17
-        uses: actions/setup-java@v5
+        uses: actions/setup-java@v6
         with:
           java-version: '25'
           distribution: 'temurin'

.github/workflows/hangar-publish.yml

@@ -18,7 +18,7 @@ jobs:
         with:
           fetch-depth: 0
       - name: Set up JDK 21
-        uses: actions/setup-java@v5
+        uses: actions/setup-java@v6
         with:
           java-version: '25'
           distribution: 'temurin'

.github/workflows/modrinth-publish.yml

@@ -18,7 +18,7 @@ jobs:
         with:
           fetch-depth: 0
       - name: Set up JDK 21
-        uses: actions/setup-java@v5
+        uses: actions/setup-java@v6
         with:
           java-version: '25'
           distribution: 'temurin'

.github/workflows/publish.yml

@@ -12,7 +12,7 @@ jobs:
         uses: actions/checkout@v7
 
       - name: Set up JDK
-        uses: actions/setup-java@v5
+        uses: actions/setup-java@v6
         with:
           distribution: 'temurin'
           java-version: 25