Update dependency prometheus_client to v0.21.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
prometheus_client	==0.15.0 -> ==0.21.0

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Release Notes

prometheus/client_python (prometheus_client)

v0.21.0: 0.21.0 / 2024-09-20

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What's Changed

[CHANGE] Reject invalid (not GET or OPTION) HTTP methods. #​1019
[ENHANCEMENT] Allow writing metrics when holding a lock for the metric in the same thread. #​1014
[BUGFIX] Check for and error on None label values. #​1012
[BUGFIX] Fix timestamp comparison. #​1038

v0.20.0: 0.20.0 / 2024-02-14

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What's Changed

• [CHANGE/BUGFIX] Update OpenMetrics Content Type to 1.0.0. #​997
• [FEATURE] Enable graceful shutdown for start_{http,wsgi}_server by returning the server and thread. #​999
• [FEATURE] Allow resetting counter metrics. #​1005
• [BUGFIX] wsgi server: address family discovery is not quite right. #​1006

v0.19.0: 0.19.0 / 2023-11-20

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What's Changed

[FEATURE] support HTTPS/TLS in start_http_server. #​946
[BUGFIX] fix: error in determining timestamp less than. #​979

v0.18.0: 0.18.0 / 2023-10-30

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[CHANGE] Remove support for Python versions < 3.8. #​936
[FEATURE] Add mostrecent aggregation to Gauge. #​967
[ENHANCEMENT] Typing improvements. #​935, #​970
[ENHANCEMENT] Allow enabling or disabling _created metrics from code. #​973
[BUGFIX] Change #!/usr/bin/python to #!/usr/bin/env python in remaining places. #​945

v0.17.1: 0.17.1 / 2023-07-19

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[BUGFIX] Use #!/usr/bin/env python instead of #!usr/bin/python in bridge/graphite.py. #​928

v0.17.0: 0.17.0 / 2023-05-24

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[ENHANCEMENT] Add additional typing. #​887, #​903
[BUGFIX] Fix typo in python_gc_objects_collected metadata. #​894
[BUGFIX] Do not include .pyc files in the build wheel. #​906

v0.16.0: 0.16.0 / 2023-01-23

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[FEATURE] Support HELP text in multiprocess mode. #​804
[ENHANCEMENT] Reduce the mmap minimum size. #​853
[BUGFIX] Use the correct OpenMetrics encoder when application/openmetrics-text is requested in ASGI apps. #​864
[BUGFIX] Allow Prometheus format parser to handle a missing space after labels. #​872

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