HTTPStatusError: Client error '406 Not Acceptable' for url 'https://phabricator.services.mozilla.com/api/differential.setdiffproperty'

[sentry]

Sentry Issue: HACKBOT-API-3

HTTPStatusError: Client error '406 Not Acceptable' for url 'https://phabricator.services.mozilla.com/api/differential.setdiffproperty'
For more information check: https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/406
  File "hackbot_runtime/actions/handlers/phabricator_handler.py", line 280, in apply
    await _set_local_commits(
  File "hackbot_runtime/actions/handlers/phabricator_handler.py", line 151, in _set_local_commits
    await _conduit_request(
  File "hackbot_runtime/actions/handlers/phabricator_handler.py", line 43, in _conduit_request
    return await _client().conduit_request(method, **payload)
  File "phabricator_client/client.py", line 53, in conduit_request
    response.raise_for_status()
  File "httpx/_models.py", line 829, in raise_for_status
    raise HTTPStatusError(message, request=request, response=self)

Failed to update Phabricator revision D314383

[suhaibmujahid]

Hackbot was able to update the revision with a new diff, but failed on differential.setdiffproperty

This happened on https://hackbot.moz.tools/runs/60e0f177-5154-402d-b492-b23b8043a223, which was triggered by https://phabricator.services.mozilla.com/D314383#10927512