chore: bump GitHub trigger plugin version to 1.1.2 and fix event naming

- Updated the version in manifest.yaml from 1.1.1 to 1.1.2.
- Changed the event naming in GithubTrigger class from 'issues_{action}' to 'issue_{action}' for consistency.

These changes ensure the plugin version is up-to-date and improve the clarity of event handling.

python/examples/github_trigger/manifest.yaml

@@ -34,4 +34,4 @@ resource:
 tags:
 - utilities
 type: plugin
-version: 1.1.1
+version: 1.1.2

python/examples/github_trigger/provider/github.py

@@ -49,7 +49,7 @@ class GithubTrigger(Trigger):
         event_type = event_type.lower()
         action: str | None = payload.get("action")
         if event_type == "issues":
-            return f"issues_{action}"
+            return f"issue_{action}"
 
         if event_type == "issue_comments":
             return f"issue_comment_{action}"