Bump bastion_linux::modernisation-platform-terraform-bastion-linux

Bumps [bastion_linux::modernisation-platform-terraform-bastion-linux](https://github.com/ministryofjustice/modernisation-platform-terraform-bastion-linux) from 4.2.0 to 4.2.1.
- [Release notes](https://github.com/ministryofjustice/modernisation-platform-terraform-bastion-linux/releases)
- [Commits](ministryofjustice/modernisation-platform-terraform-bastion-linux@v4.2.0...v4.2.1)

---
updated-dependencies:
- dependency-name: bastion_linux::github::ministryofjustice/modernisation-platform-terraform-bastion-linux::v4.2.0
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

terraform/environments/example/ec2_bastion_linux.tf

@@ -1,6 +1,6 @@
 # tfsec:ignore:aws-s3-enable-bucket-encryption tfsec:ignore:aws-s3-encryption-customer-key tfsec:ignore:aws-s3-enable-bucket-logging tfsec:ignore:aws-s3-enable-versioning
 module "bastion_linux" {
-  source = "github.com/ministryofjustice/modernisation-platform-terraform-bastion-linux?ref=v4.2.0"
+  source = "github.com/ministryofjustice/modernisation-platform-terraform-bastion-linux?ref=v4.2.1"
 
   providers = {
     aws.share-host   = aws.core-vpc # core-vpc-(environment) holds the networking for all accounts