Fix golangci-lint reported issue in the operator and bump the action to v6

[adejanovski]

What this PR does:

Which issue(s) this PR fixes: Fixes #

Checklist

• [ ] Changes manually tested
• [x] Automated Tests added/updated
• [ ] Documentation added/updated
• [x] CHANGELOG.md updated (not required for documentation PRs)
• [ ] CLA Signed: DataStax CLA

[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud