Bump bastion_linux::modernisation-platform-terraform-bastion-linux from 4.2.0 to 4.2.1 in /terraform/environments/performance-hub #1223

Job	Run time
destroy-development	0s
strategy / strategy	2s
terraform (production, plan) / plan	1m 54s
terraform (preproduction, plan) / plan	2m 9s
terraform (development, plan_apply) / plan	1m 40s
terraform (development, plan_apply) / apply	0s
terraform (production, plan) / apply	0s
terraform (preproduction, plan) / apply	0s
	5m 45s

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