fix: upstream_protocol reference in auth_orgs

[kd7lxl]

What this PR does:
auth_orgs was broken because inside the range the upstream protocol feature tried to read the variable from local scope when it only exists in global scope.

Demo:

% helm template . --set config.auth_enabled=true --set 'nginx.config.auth_orgs={org_name}' > /dev/null
Error: template: cortex/templates/nginx/nginx-dep.yaml:28:28: executing "cortex/templates/nginx/nginx-dep.yaml" at <include (print $.Template.BasePath "/nginx/nginx-config.yaml") .>: error calling include: template: cortex/templates/nginx/nginx-config.yaml:163:36: executing "cortex/templates/nginx/nginx-config.yaml" at <.Values.nginx.config.upstream_protocol>: can't evaluate field Values in type interface {}

Use --debug flag to render out invalid YAML

Which issue(s) this PR fixes:
Fixes bug in #506

Checklist

• CHANGELOG.md updated - the order of entries should be [CHANGE], [FEATURE], [ENHANCEMENT], [BUGFIX]