net-mgmt/prometheus2: Update to 2.9.2

Changelog:

• Make sure subquery range is taken into account for selection
• Exhaust every request body before closing it
• Cmd/promtool: return errors from rule evaluations
• Remote Storage: string interner should not panic in release
• Fix memory allocation regression in mergedPostings.Seek

https://github.com/prometheus/prometheus/releases/tag/v2.9.2

PR: 237671
Submitted by: David O'Rourke <dor.bsd@xm0.uk> (maintainer)
Approved by: mentors (implicit)