⬆️ [#4057] Bump extension to version without zds_client import

The import was a left-over import that didn't have any effect.

requirements/extensions.txt

@@ -504,7 +504,7 @@ oauthlib==3.2.2
     # via
     #   -r requirements/base.txt
     #   requests-oauthlib
-open-forms-ext-haalcentraal-hr==0.3.0
+open-forms-ext-haalcentraal-hr==0.3.1
     # via -r requirements/extensions.in
 open-forms-ext-token-exchange==0.4.0
     # via -r requirements/extensions.in