build(deps): bump github.com/elastic/elastic-agent-system-metrics from 0.11.18 to 0.12.0 (#5273)

* build(deps): bump github.com/elastic/elastic-agent-system-metrics

Bumps [github.com/elastic/elastic-agent-system-metrics](https://github.com/elastic/elastic-agent-system-metrics) from 0.11.18 to 0.12.0.
- [Release notes](https://github.com/elastic/elastic-agent-system-metrics/releases)
- [Commits](elastic/elastic-agent-system-metrics@v0.11.18...v0.12.0)

---
updated-dependencies:
- dependency-name: github.com/elastic/elastic-agent-system-metrics
  dependency-version: 0.12.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

* Post dependabot file modifications

* fix: resolve breaking API changes

* fix: replace deprecated calls to NewRegistry with GetOrCreateRegistry

---------

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: dependabot[bot] <dependabot[bot]@users.noreply.github.com>
Co-authored-by: Panos Koutsovasilis <[email protected]>
(cherry picked from commit 898abd5)

# Conflicts:
#	NOTICE-fips.txt
#	NOTICE.txt
#	go.mod
#	go.sum
#	internal/pkg/api/metrics.go

Author: dependabot[bot]