gradle: Limit jitpack to libsu; drop unused google's maven repo

Ref: https://docs.gradle.org/current/userguide/declaring_repositories_adv.html#sec:repository-content-filtering

Signed-off-by: Aayush Gupta <aayushgupta219@gmail.com>

settings.gradle.kts

@@ -30,8 +30,12 @@ dependencyResolutionManagement {
     repositories {
         google()
         mavenCentral()
-        maven("https://jitpack.io/")
-        maven("https://maven.google.com/")
+        // libsu is only available via jitpack
+        maven("https://jitpack.io/") {
+            content {
+                includeModule("com.github.topjohnwu.libsu", "core")
+            }
+        }
     }
 }
 include(":app")