Bump modules/cnames AWS provider constraint to ~> 6.0

CHANGELOG.md

@@ -18,6 +18,8 @@ Optional release notice.
 
 ## [Unreleased] - YYYY-MM-DD
 
+- [Fixed] Relax `modules/cnames` AWS provider constraint from `~> 5.0` to `>= 5.79, < 7.0` so it resolves alongside the `vpc` module's `aws >= 6.28` requirement — using `quilt` + `cnames` in one root previously failed `terraform init` ([#117](https://github.com/quiltdata/iac/pull/117))
+
 ## [1.7.1] - 2026-06-04
 
 - [Fixed] Pin every registry module with `~>` so an upstream major can't silently break `terraform plan`/`apply` — resolves the `security-group` v6.0.0 break and constrains the rest (`security-group`/`rds` → `~> 5.0`, `vpc` → `~> 6.0`) ([#110](https://github.com/quiltdata/iac/pull/110), [#112](https://github.com/quiltdata/iac/pull/112))

modules/cnames/main.tf

@@ -1,8 +1,12 @@
 terraform {
   required_providers {
     aws = {
-      source  = "hashicorp/aws"
-      version = "~> 5.0"
+      source = "hashicorp/aws"
+      # Span 5.x and 6.x: this module only manages aws_route53_record (stable
+      # across both majors), and it is used alongside the vpc module, whose
+      # terraform-aws-modules/vpc ~> 6.0 dependency requires aws >= 6.28. A
+      # ~> 5.0 pin here made `quilt` + `cnames` unresolvable in one root.
+      version = ">= 5.79, < 7.0"
     }
   }
 }