(actions) update PR references

Author: actions-user

changelog.d/20260306_183052_sirosen_gcs_collection_client.rst

@@ -5,4 +5,4 @@ Added
   ``globus_sdk.experimental.gcs_collection_client``.
   The new client has no methods other than the base HTTP ones, but contains the
   collection ID and scopes in the correct locations for the SDK token management
-  mechanisms to use. (:pr:`NUMBER`)
+  mechanisms to use. (:pr:`1375`)