chore(deps): update dependency prometheus-client to v0.21.1

[marvin-serp-bot]

This PR contains the following updates:

Package	Update	Change
prometheus-client	minor	==0.19.0 -> ==0.21.1

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Release Notes

prometheus/client_python (prometheus-client)

v0.21.1: 0.21.1 / 2024-12-03

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What's Changed

[BUGFIX] Revert incorrect use of reentrant locks. #​1076

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

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