try overriding jvm args

Author: ldetmer

test/integration/BUILD.bazel

@@ -93,6 +93,10 @@ java_gapic_test(
     test_classes = [
         "com.google.storage.v2.StorageClientTest",
     ],
+     jvm_flags = [
+            "-Xmx1G",
+            # override any inherited ones
+        ],
     runtime_deps = ["@com_google_googleapis//google/storage/v2:storage_java_gapic_test"],
 )