Add clippy_test_deps to workspace member of repo

Author: flip1995

Cargo.toml

@@ -13,6 +13,7 @@ members = [
   "src/tools/cargotest",
   "src/tools/clippy",
   "src/tools/clippy/clippy_dev",
+  "src/tools/clippy/clippy_test_deps",
   "src/tools/collect-license-metadata",
   "src/tools/compiletest",
   "src/tools/coverage-dump",