fix: remove unnecessary dependency on libcst and scripts

scripts/fixup_admin_v1_keywords.py

@@ -17,7 +17,12 @@
 
 import argparse
 import os
-import libcst as cst
+
+try:
+    import libcst as cst
+except ImportError as exception:
+    raise ImportError('Run python -m pip install "libcst >= 0.2.5" command to install libcst.')
+
 import pathlib
 import sys
 from typing import (Any, Callable, Dict, List, Sequence, Tuple)

scripts/fixup_firestore_admin_v1_keywords.py

@@ -17,7 +17,12 @@
 
 import argparse
 import os
-import libcst as cst
+
+try:
+    import libcst as cst
+except ImportError as exception:
+    raise ImportError('Run `python -m pip install "libcst >= 0.2.5"` to install libcst.')
+
 import pathlib
 import sys
 from typing import (Any, Callable, Dict, List, Sequence, Tuple)

scripts/fixup_firestore_v1_keywords.py

@@ -17,7 +17,12 @@
 
 import argparse
 import os
-import libcst as cst
+
+try:
+    import libcst as cst
+except ImportError as exception:
+    raise ImportError('Run `python -m pip install "libcst >= 0.2.5"` to install libcst.')
+
 import pathlib
 import sys
 from typing import (Any, Callable, Dict, List, Sequence, Tuple)

setup.py

@@ -28,7 +28,6 @@
     "google-api-core[grpc] >= 1.22.1, < 2.0.0dev",
     "google-cloud-core >= 1.4.1, < 2.0dev",
     "pytz",
-    "libcst >= 0.2.5",
     "proto-plus >= 1.3.0",
 ]
 extras = {}