🐛 Fix: app auth token expiration edge case (#219)

Author: mchieco

githubkit/auth/app.py

@@ -212,9 +212,13 @@ def sync_auth_flow(
             response.read()
             response = self._parse_installation_auth_response(response)
             token = response.parsed_data.token
-            expire = datetime.strptime(
-                response.parsed_data.expires_at, "%Y-%m-%dT%H:%M:%SZ"
-            ).replace(tzinfo=timezone.utc) - datetime.now(timezone.utc)
+            expire = (
+                datetime.strptime(
+                    response.parsed_data.expires_at, "%Y-%m-%dT%H:%M:%SZ"
+                ).replace(tzinfo=timezone.utc)
+                - datetime.now(timezone.utc)
+                - timedelta(minutes=1)
+            )
             cache.set(key, token, expire)
         request.headers["Authorization"] = f"token {token}"
         yield request
@@ -250,9 +254,13 @@ async def async_auth_flow(
             await response.aread()
             response = self._parse_installation_auth_response(response)
             token = response.parsed_data.token
-            expire = datetime.strptime(
-                response.parsed_data.expires_at, "%Y-%m-%dT%H:%M:%SZ"
-            ).replace(tzinfo=timezone.utc) - datetime.now(timezone.utc)
+            expire = (
+                datetime.strptime(
+                    response.parsed_data.expires_at, "%Y-%m-%dT%H:%M:%SZ"
+                ).replace(tzinfo=timezone.utc)
+                - datetime.now(timezone.utc)
+                - timedelta(minutes=1)
+            )
             await cache.aset(key, token, expire)
         request.headers["Authorization"] = f"token {token}"
         yield request