nomis: production DNS entry tweaks

[drobinson-moj]

Using "c.nomis.service.justice.gov.uk" instead of "c.production.nomis.service.justice.gov.uk" for production endpoint to align with what's been configured on Mojo devices.

[github-actions]

TFSEC Scan Success

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TFSEC will check the following folders:

Checkov Scan Success

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Checkov will check the following folders:

CTFLint Scan Success

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Setting default tflint config...
Running tflint --init...
Installing `terraform` plugin...
Installed `terraform` (source: github.com/terraform-linters/tflint-ruleset-terraform, version: 0.2.1)
tflint will check the following folders: