Upgrade Java version from 21 to 25

Author: Thihup

lib/build.gradle

@@ -20,13 +20,13 @@ def jextractHome = project.hasProperty('jextract.home')
         : null
 
 java {
-    sourceCompatibility = JavaVersion.VERSION_21
-    targetCompatibility = JavaVersion.VERSION_21
+    sourceCompatibility = JavaVersion.VERSION_25
+    targetCompatibility = JavaVersion.VERSION_25
 }
 
 java {
     toolchain {
-        languageVersion.set(JavaLanguageVersion.of(21))
+        languageVersion.set(JavaLanguageVersion.of(25))
     }
 }
 
@@ -103,4 +103,4 @@ publishing {
             }
         }
     }
-}
+}