chore: Update nginx-unprivileged

[jlm0x017]

What this PR does / why we need it:

1.27-alpine is the latest at the time of change - https://hub.docker.com/r/nginxinc/nginx-unprivileged/tags

the 1.24-alpine image is reportedly vulnerable to the following CVE: CVE-2023-44487 CVE-2024-2398 CVE-2024-2466 CVE-2024-34459 CVE-2024-6197

Which issue(s) this PR fixes: n/a

Special notes for your reviewer: just added https://github.com/grafana/loki/pull/13979 that also bumps the chart version. they share the same chart version as I have no idea which will be approved first. If approved and committed the linked PR will need version bumped.

Checklist

• [x] Reviewed the CONTRIBUTING.md guide (required)
• [ ] Documentation added
• [ ] Tests updated
• [x] Title matches the required conventional commits format, see here
  • Note that Promtail is considered to be feature complete, and future development for logs collection will be in Grafana Alloy. As such, feat PRs are unlikely to be accepted unless a case can be made for the feature actually being a bug fix to existing behavior.
• [ ] Changes that require user attention or interaction to upgrade are documented in docs/sources/setup/upgrade/_index.md
• [x] For Helm chart changes bump the Helm chart version in production/helm/loki/Chart.yaml and update production/helm/loki/CHANGELOG.md and production/helm/loki/README.md. Example PR
• [ ] If the change is deprecating or removing a configuration option, update the deprecated-config.yaml and deleted-config.yaml files respectively in the tools/deprecated-config-checker directory. Example PR

[CLAassistant]

All committers have signed the CLA.

[paul1r]

@jlm0x017 once you rebase this, I'll kick off the builds and get it merged. It may be Thursday when I get to it, but I will do my best to get to it tomorrow.

[jlm0x017]

@paul1r updated; thanks!