fix: duplicated prometheus timeseries error caused by inprogress requests

[freud14-tm]

What does this do?

Handle value error when we set should_instrument_requests_inprogress and use the provided registry.

Why do we need it?

To fix > Add a description of the problem the feature is trying to solve..

Who is this for?

Add information on what kind of persona the feature is for.

Linked issues

> Add a description of the problem the feature is trying to solve.

[freud14-tm]

@trallnag Would it possible to run the workflows awaiting for approval and review this? It's a small PR.

[codecov]

Codecov Report

Attention: Patch coverage is 40.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 95.22%. Comparing base (2e1568e) to head (f84e917).

Files with missing lines	Patch %	Lines
...rc/prometheus_fastapi_instrumentator/middleware.py	40.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #324      +/-   ##
==========================================
- Coverage   95.97%   95.22%   -0.76%     
==========================================
  Files           5        5              
  Lines         373      377       +4     
==========================================
+ Hits          358      359       +1     
- Misses         15       18       +3     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.