chore(deps): update dependency prometheus_client to v0.20.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
prometheus_client	==0.17.0 -> ==0.20.0

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Release Notes

prometheus/client_python (prometheus_client)

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

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