Use compat-target module to test compatibility from SDK 28

To avoid breaking current test CI, related test for compileSdk
compatility of shadowOf is commented. We can enable it when we are
working on resolving compatility problem of shadowOf.

Signed-off-by: utzcoz <utzcoz@outlook.com>
diff --git a/settings.gradle b/settings.gradle
index e1b65d7..9a187d8 100644
--- a/settings.gradle
+++ b/settings.gradle
@@ -33,7 +33,7 @@
 include ':integration_tests:ctesque'
 include ':integration_tests:security-providers'
 include ":integration_tests:mockk"
-include ':integration_tests:compat-target29'
+include ':integration_tests:compat-target28'
 include ":integration_tests:multidex"
 include ":integration_tests:sparsearray"
 include ':testapp'