[7.17](backport #43653) chore: bump golang.org/x/net to v0.38.0

[mergify]

Bump golang.org/x/net to v0.38.0 to fix CVE-2025-22870 and CVE-2025-22872.

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This is an automatic backport of pull request #43653 done by Mergify.

[mergify]

Cherry-pick of 10858f9 has failed:

On branch mergify/bp/7.17/pr-43653
Your branch is up to date with 'origin/7.17'.

You are currently cherry-picking commit 10858f98c.
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Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   NOTICE.txt
	both modified:   go.mod
	both modified:   go.sum

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[elasticmachine]

Pinging @elastic/elastic-agent-data-plane (Team:Elastic-Agent-Data-Plane)