This upgrades edx-django-utils to a version that drops the newrelic
dependency. However, I also needed to fix a test that was sensitive to the
number of warnings that the code under test produced. With newrelic gone,
there's an additional warning.
- Fix test so that it isn't sensitive to unrelated warnings
- Fix typo in warning
For reference, this is the new warning:
```
"WARNING:edx_django_utils.monitoring.internal.backends:Could not load OPENEDX_TELEMETRY option 'edx_django_utils.monitoring.NewRelicBackend': Exception('Could not load New Relic monitoring backend; package not present.')"
```
This is expected due to edx-django-utils still defaulting to NR for
telemetry. (Perhaps the subject of a future breaking change.)
4856539b22