regexp filter: use modified package with optimisations #5542
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See https://github.com/grafana/regexp/tree/speedup#readme Includes the following changes proposed upstream: * [regexp: allow patterns with no alternates to be one-pass](https://go-review.googlesource.com/c/go/+/353711) * [regexp: speed up onepass prefix check](https://go-review.googlesource.com/c/go/+/354909) * [regexp: handle prefix string with fold-case](https://go-review.googlesource.com/c/go/+/358756) * [regexp: avoid copying each instruction executed](https://go-review.googlesource.com/c/go/+/355789) * [regexp: allow prefix string anchored at beginning](https://go-review.googlesource.com/c/go/+/377294)
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What this PR does / why we need it:
This is a repeat of #5315, which was reverted in #5413.
See https://github.com/grafana/regexp/tree/speedup#readme
Includes the following changes proposed upstream:
Checklist
CHANGELOG.mdabout the changes - there is already an entry for filters: use faster regexp package #5315.