Update dependency prometheus_client to v0.20.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
prometheus_client	0.19.0 -> 0.20.0

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Release Notes

prometheus/client_python (prometheus_client)

v0.20.0: 0.20.0 / 2024-02-14

Compare Source

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

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