Bump prometheus/client_golang to v1.12.2

[tosi3k]

What type of PR is this?

/kind feature

What this PR does / why we need it:

Bump prometheus/client_golang to v1.12.2 to be able to add more options to NewGoCollector, i.e. to be able to export more Golang-related metrics.

Which issue(s) this PR fixes:

No issue is opened for that.

Special notes for your reviewer:

/sig instrumentation

Does this PR introduce a user-facing change?

NONE

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[k8s-ci-robot]

Please note that we're already in Test Freeze for the release-1.25 branch. This means every merged PR will be automatically fast-forwarded via the periodic ci-fast-forward job to the release branch of the upcoming v1.25.0 release.

Fast forwards are scheduled to happen every 6 hours, whereas the most recent run was: Thu Aug 18 07:40:11 UTC 2022.

[tosi3k]

/assign @mborsz

[tosi3k]

/assign @liggitt

[mborsz]

/lgtm

[tosi3k]

/retest

[leilajal]

/triage accepted

[liggitt]

dependency update lgtm, are we exporting these by default or does that depend on activation in #111910?

[tosi3k]

We're not, their export require additional options to be passed to Prometheus's Go collector that we add in component-base staging repo in #111910.

[liggitt]

/approve
for dependency update

will merge once master reopens for 1.26

[k8s-ci-robot]

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