Fix CVE vulnerabilities in Go dependencies (Jul 2026)

## Description
Multiple CVE vulnerabilities have been identified in project dependencies that need to be resolved:
- GO-2026-5037
- GO-2026-5038
- GO-2026-5039
- sensu-api-tools related vulnerabilities

## Impact
Security vulnerabilities in dependencies may expose the backend to exploits.

## Related PR
- #5167