[8.19](backport #5211) build(deps): bump github.com/elastic/elastic-agent-libs from 0.21.4 to 0.21.6

[mergify]

Bumps github.com/elastic/elastic-agent-libs from 0.21.4 to 0.21.6.

Release notes

Sourced from github.com/elastic/elastic-agent-libs's releases.

v0.21.6

What's Changed

• feat: add newzaplogger and rework logptest by @​kruskall in elastic/elastic-agent-libs#335

Full Changelog: elastic/elastic-agent-libs@v0.21.5...v0.21.6

v0.21.5

What's Changed

• Replace global loggers with local loggers in tlscommon package by @​khushijain21 in elastic/elastic-agent-libs#334
• make logger on TLSConfig global by @​khushijain21 in elastic/elastic-agent-libs#336

Full Changelog: elastic/elastic-agent-libs@v0.21.4...v0.21.5

Commits

• 531c756 feat: add newzaplogger and rework logptest (#335)
• 714a3cd make logger on TLSConfig global (#336)
• a9550f1 Replace global loggers with local loggers in tlscommon package (#334)
• See full diff in compare view

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---

This is an automatic backport of pull request #5211 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 13bea07 has failed:

On branch mergify/bp/8.19/pr-5211
Your branch is up to date with 'origin/8.19'.

You are currently cherry-picking commit 13bea07.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   internal/pkg/action/dispatcher.go
	modified:   internal/pkg/api/error.go
	modified:   internal/pkg/api/handleAck.go
	modified:   internal/pkg/api/handleCheckin.go
	modified:   internal/pkg/bulk/engine.go
	deleted:    internal/pkg/logger/ecs.go
	new file:   internal/pkg/logger/ecs/ecs.go
	modified:   internal/pkg/logger/http.go
	modified:   internal/pkg/logger/http_test.go
	modified:   internal/pkg/logger/logger.go
	modified:   internal/pkg/logger/logger_test.go
	renamed:    internal/pkg/logger/zapStub.go -> internal/pkg/logger/zap/zapStub.go
	modified:   internal/pkg/policy/monitor.go
	modified:   internal/pkg/policy/policy_output.go
	modified:   internal/pkg/policy/self.go

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   NOTICE-fips.txt
	both modified:   NOTICE.txt
	both modified:   go.mod
	both modified:   go.sum
	both modified:   internal/pkg/api/metrics.go
	both modified:   internal/pkg/api/server.go
	both modified:   internal/pkg/config/output.go
	both modified:   internal/pkg/dl/policies.go
	both modified:   magefile.go

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

[prodsecmachine]

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[pkoutsovasilis]

no longer relevant https://github.com/elastic/fleet-server/blob/8.19/go.mod#L10