fix(deps): update module github.com/prometheus/client_golang to v1.20.4

[theriver-bot[bot]]

This PR contains the following updates:

Package	Type	Update	Change	OpenSSF
github.com/prometheus/client_golang	require	patch	v1.20.3 -> v1.20.4

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Release Notes

prometheus/client_golang (github.com/prometheus/client_golang)

### [`v1.20.4`](https://redirect.github.com/prometheus/client_golang/releases/tag/v1.20.4) [Compare Source](https://redirect.github.com/prometheus/client_golang/compare/v1.20.3...v1.20.4) - \[BUGFIX] histograms: Fix a possible data race when appending exemplars vs metrics gather. [#​1623](https://redirect.github.com/prometheus/client_golang/issues/1623)

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