Add workflow permission and fix Java matrix

Grant the workflow read-only access to repository contents (set permissions.contents: read) to limit GITHUB_TOKEN privileges. Also correct a stray space in the Java matrix entry (' 25' -> '25') so the matrix parses the Java versions correctly.

Author: mercyblitz

.github/workflows/maven-build.yml

@@ -8,6 +8,9 @@
 
 name: Maven Build
 
+permissions:
+  contents: read
+
 on:
   push:
     branches: [ 'main', 'dev' ]
@@ -19,7 +22,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        java: [ '8', '11' , '17' , '21' ,' 25' ]
+        java: [ '8', '11' , '17' , '21' , '25' ]
     steps:
       - name: Checkout Source
         uses: actions/checkout@v5