[release/4][BACKPORT] fix: Bump prometheus image to v2.29.2

[d2iq-mergebot]

This is a backport of the following PR:

#1302

What type of PR is this?

bug

What this PR does/ why we need it:

bump prometheus image to fix a cops ticket

Which issue(s) this PR fixes:

https://jira.d2iq.com/browse/D2IQ-78551
https://jira.d2iq.com/browse/COPS-7011

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

fix: Bump Prometheus to v2.29.2 which fixes head GC and pending readers race condition that caused issues with rule evaluations.

Checklist

• The commit message explains the changes and why are needed.
• The code builds and passes lint/style checks locally.
• The relevant subset of integration tests pass locally.
• The core changes are covered by tests.
• The documentation is updated where needed.

[d2iq-mergebot]

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[branden]

LGTM. Force-merging to bypass the requirement that commits must be signed.