fix: remove unnecessary dependency on libcst

setup.py

@@ -31,7 +31,6 @@
 dependencies = [
     "google-api-core[grpc] >= 1.22.2, < 2.0.0dev",
     "proto-plus >= 1.10.0",
-    "libcst >= 0.2.5",
     "google-cloud-core >= 1.4.1, < 2.0dev",
     "google-resumable-media >= 0.6.0, < 2.0dev",
     "six >=1.13.0,< 2.0.0dev",
@@ -125,7 +124,6 @@
     install_requires=dependencies,
     extras_require=extras,
     python_requires=">=3.6",
-    scripts=["scripts/fixup_bigquery_v2_keywords.py"],
     include_package_data=True,
     zip_safe=False,
 )

synth.py

@@ -36,6 +36,7 @@
         "README.rst",
         "noxfile.py",
         "setup.py",
+        "scripts/fixup_bigquery_v2_keywords.py",
         library / f"google/cloud/bigquery/__init__.py",
         library / f"google/cloud/bigquery/py.typed",
         # There are no public API endpoints for the generated ModelServiceClient,