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

This MR contains the following updates:

Package	Type	Update	Change
github.com/prometheus/client_golang	require	patch	v1.20.1 -> v1.20.2

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Release Notes

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

v1.20.2

Compare Source

• [BUGFIX] promhttp: Unset Content-Encoding header when data is uncompressed. #​1596

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