added 2.2.4 to prebuilts/gradle-plugin

Test: integration tests
Bug: b.android.com/230285
Change-Id: If6a9a408fd32b5e8cf0c5d4911e6e3d0ec862a68
diff --git a/com/android/tools/sdklib/maven-metadata.xml.sha1 b/com/android/tools/sdklib/maven-metadata.xml.sha1
index e505dce..76ff6f5 100644
--- a/com/android/tools/sdklib/maven-metadata.xml.sha1
+++ b/com/android/tools/sdklib/maven-metadata.xml.sha1
@@ -1 +1 @@
-0b94b0e71993b4d44ae1b19b2a38f82f0b7c18cc
\ No newline at end of file
+b7a9f45720eb91b0f0eca70cffa8412f03d1066d
\ No newline at end of file