Migrate to using = for property setting

Gradle has deprecated `compileSdk 35` style syntax in
Gradle 8.12, in preparation for that upgrade, fix up the violations
in androidx build.gradle files

Test: ./gradlew bOS --dry-run -> https://ge.androidx.dev/s/bqs4fmehxdqzs/deprecations
      and after -> https://ge.androidx.dev/s/nvc7s5bdfpuaa/deprecations
Change-Id: Ic4787d46f40e3856e5f0fa1e3c0a63e3dddc2108
diff --git a/camera/camera-camera2-pipe-testing/build.gradle b/camera/camera-camera2-pipe-testing/build.gradle
index 9dfa1cd..0e56777d 100644
--- a/camera/camera-camera2-pipe-testing/build.gradle
+++ b/camera/camera-camera2-pipe-testing/build.gradle
@@ -55,7 +55,7 @@
     }
     // Use Robolectric 4.+
     testOptions.unitTests.includeAndroidResources = true
-    namespace "androidx.camera.camera2.pipe.testing"
+    namespace = "androidx.camera.camera2.pipe.testing"
 }
 
 // Allow usage of Kotlin's @OptIn.