deps: update module github.com/prometheus/client_golang to v1.20.2

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
github.com/prometheus/client_golang	v1.20.1 -> v1.20.2

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Release Notes

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

### [`v1.20.2`](https://togithub.com/prometheus/client_golang/releases/tag/v1.20.2) [Compare Source](https://togithub.com/prometheus/client_golang/compare/v1.20.1...v1.20.2) - \[BUGFIX] promhttp: Unset Content-Encoding header when data is uncompressed. [#​1596](https://togithub.com/prometheus/client_golang/issues/1596)

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