[bazel] Update static analyzer unit test deps for clangTesting

Author: rnk

utils/bazel/llvm-project-overlay/clang/unittests/BUILD.bazel

@@ -333,6 +333,7 @@ cc_library(
         "//clang:frontend",
         "//clang:static_analyzer_core",
         "//clang:static_analyzer_frontend",
+        "//clang:testing",
         "//clang:tooling",
         "//llvm:gtest",
     ],