Revert "chore: ci fixups and poetry update"

This reverts commit d0b986025e.

src/healthchecks_io/schemas/integrations.py

@@ -2,6 +2,7 @@
 
 https://healthchecks.io/docs/api/
 """
+from typing import Dict
 
 from pydantic import BaseModel
 
@@ -14,6 +15,6 @@ class Integration(BaseModel):
     kind: str
 
     @classmethod
-    def from_api_result(cls, integration_dict: dict[str, str]) -> "Integration":
+    def from_api_result(cls, integration_dict: Dict[str, str]) -> "Integration":
         """Converts a dictionary from the healthchecks api into an Integration object."""
         return cls(**integration_dict)