add supplier-api-admins to infra approvers

Author: masl2

.github/CODEOWNERS

@@ -5,7 +5,7 @@
 /.github/                   @NHSDigital/nhs-notify-supplier-api-admins
 *.code-workspace            @NHSDigital/nhs-notify-supplier-api-admins
 /docs/                      @NHSDigital/nhs-notify-supplier-api
-/infrastructure/terraform/  @NHSDigital/nhs-notify-platform
+/infrastructure/terraform/  @NHSDigital/nhs-notify-platform @NHSDigital/nhs-notify-supplier-api-admins
 
 # Codeowners must be final check
 /.github/CODEOWNERS         @NHSDigital/nhs-notify-code-owners