fix: do not apply namespace if it is not available in agp (#2448)

## Description

`namespace` method is available since AGP 7.x.



## Test plan

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Describe how did you test this change here.
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Author: WoLewicki

android/build.gradle

@@ -168,7 +168,10 @@ repositories {
 
 android {
     compileSdkVersion safeExtGet("compileSdkVersion", 28)
-    namespace "com.swmansion.gesturehandler"
+    def agpVersion = com.android.Version.ANDROID_GRADLE_PLUGIN_VERSION
+    if (agpVersion.tokenize('.')[0].toInteger() >= 7) {
+        namespace "com.swmansion.gesturehandler"
+    }
 
     // Used to override the NDK path/version on internal CI or by allowing
     // users to customize the NDK path/version from their root project (e.g. for M1 support)