chore: add SkArchon to codeowners for router

[SkArchon]

Add SkArchon to codeowners for router

Summary by CodeRabbit

• Chores
  • Updated code ownership assignments for internal router-related modules.

Checklist

• I have discussed my proposed changes in an issue and have received approval to proceed.
• I have followed the coding standards of the project.
• Tests or benchmarks have been added or updated.
• Documentation has been updated on https://github.com/wundergraph/cosmo-docs.
• I have read the Contributors Guide.

[coderabbitai]

Walkthrough

This PR updates code ownership assignments in the CODEOWNERS file, expanding owners for router, router-tests, and router-plugin paths, and introducing ownership for the router/pkg/pubsub path.

Changes

Cohort / File(s)	Summary
Code Ownership Configuration .github/CODEOWNERS	Updated ownership assignments for router-related paths, expanding owners for router, router-tests, and router-plugin; introduced new owner for router/pkg/pubsub path.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• chore(github): add CODEOWNERS file and remove pr-description workflow #1998: Modifies the same CODEOWNERS entries for router, router-plugin, router-tests, and router/pkg/pubsub paths.
• chore: update codeowners #2104: Edits the CODEOWNERS file and touches the same ownership entries.
• chore: add Dominik to Codeowners #2321: Modifies the /router/pkg/pubsub entry in CODEOWNERS.

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and specifically describes the main change: adding SkArchon to the CODEOWNERS file for the router, which matches the changeset exactly.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

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✨ Finishing Touches

• 📝 Generate docstrings (stacked PR)
• 📝 Generate docstrings (commit on current branch)

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[StarpTech]

LGTM