[build] Upgrade to Gradle 8.14.3 (#8164)

This fixes local builds with JDK 24.

I fixed deprecation warnings from `./gradlew wrapper --warning-mode all`
as well.

wpigui/publish.gradle

@@ -63,8 +63,8 @@ model {
                 artifact cppSourcesZip
 
                 artifactId = baseArtifactId
-                groupId artifactGroupId
-                version wpilibVersioning.version.get()
+                groupId = artifactGroupId
+                version = wpilibVersioning.version.get()
             }
         }
     }