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).
Report is 2 commits behind head on master.

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 

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