[TSDK-287] Fix Calendar availability functions not using the correct authentication method (#214)

The Calendar availability functions were using an incorrect authentication method when requesting to the API

Author: mrashed-dev

CHANGELOG.md

@@ -4,6 +4,7 @@ nylas-python Changelog
 Unreleased
 ----------------
 * Add support for getting the number of queried objects (count view)
+* Fix Calendar availability functions not using the correct authentication method
 
 v5.7.0
 ----------------

nylas/client/client.py

@@ -287,7 +287,7 @@ def free_busy(self, emails, start_at, end_at):
             "start_time": start_time,
             "end_time": end_time,
         }
-        resp = self._request(HttpMethod.POST, url, json=data)
+        resp = self._request(HttpMethod.POST, url, json=data, cls=Calendar)
         _validate(resp)
         return resp.json()
 
@@ -357,7 +357,7 @@ def availability(
         if round_robin is not None:
             data["round_robin"] = round_robin
 
-        resp = self._request(HttpMethod.POST, url, json=data)
+        resp = self._request(HttpMethod.POST, url, json=data, cls=Calendar)
         _validate(resp)
         return resp.json()
 
@@ -410,7 +410,7 @@ def consecutive_availability(
         if buffer is not None:
             data["buffer"] = buffer
 
-        resp = self._request(HttpMethod.POST, url, json=data)
+        resp = self._request(HttpMethod.POST, url, json=data, cls=Calendar)
         _validate(resp)
         return resp.json()