fix: Add context manager return types (#234)

* docs: Add documentation for enums

fix: Add context manager return types

chore: Update gapic-generator-python to v1.8.1
PiperOrigin-RevId: 503210727

Source-Link: googleapis/googleapis@a391fd1

Source-Link: googleapis/googleapis-gen@0080f83
Copy-Tag: eyJwIjoiLmdpdGh1Yi8uT3dsQm90LnlhbWwiLCJoIjoiMDA4MGY4MzBkZWMzN2MzMzg0MTU3MDgyYmNlMjc5ZTM3MDc5ZWE1OCJ9

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

packages/google-cloud-phishing-protection/google/cloud/phishingprotection_v1beta1/services/phishing_protection_service_v1_beta1/client.py

@@ -551,7 +551,7 @@ def sample_report_phishing():
         # Done; return the response.
         return response
 
-    def __enter__(self):
+    def __enter__(self) -> "PhishingProtectionServiceV1Beta1Client":
         return self
 
     def __exit__(self, type, value, traceback):

packages/google-cloud-phishing-protection/samples/generated_samples/snippet_metadata_google.cloud.phishingprotection.v1beta1.json

@@ -8,7 +8,7 @@
     ],
     "language": "PYTHON",
     "name": "google-cloud-phishing-protection",
-    "version": "1.8.0"
+    "version": "0.1.0"
   },
   "snippets": [
     {