Update module github.com/prometheus/client_golang to v1.20.5

v1.20.5: / 2024-10-15

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We decided to revert the testutil change that made our util functions less error-prone, but created a lot of work for our downstream users. Apologies for the pain! This revert should not cause any major breaking change, even if you already did the work--unless you depend on the exact error message.

Going forward, we plan to reinforce our release testing strategy [1],[2] and deliver an enhanced testutil package/module with more flexible and safer APIs.

Thanks to @​dashpole @​dgrisonnet @​kakkoyun @​ArthurSens @​vesari @​logicalhan @​krajorama @​bwplotka who helped in this patch release! 🤗

Changelog

[BUGFIX] testutil: Reverted #​1424; functions using compareMetricFamilies are (again) only failing if filtered metricNames are in the expected input. #​1645