The security_policy_name argument is now set to a provided argument value, rather than hardcoded. In the future we should consider a data source to remove the dependency on the hardcoded policy name altogether.

```console
% make testacc PKG=transfer TESTS=TestAccTransferConnector_
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go1.21.8 test ./internal/service/transfer/... -v -count 1 -parallel 20 -run='TestAccTransferConnector_'  -timeout 360m
=== RUN   TestAccTransferConnector_basic
--- PASS: TestAccTransferConnector_basic (19.12s)
=== RUN   TestAccTransferConnector_sftpConfig
--- PASS: TestAccTransferConnector_sftpConfig (11.95s)
=== RUN   TestAccTransferConnector_securityPolicyName
--- PASS: TestAccTransferConnector_securityPolicyName (11.71s)
=== RUN   TestAccTransferConnector_disappears
--- PASS: TestAccTransferConnector_disappears (9.65s)
=== RUN   TestAccTransferConnector_tags
--- PASS: TestAccTransferConnector_tags (24.38s)
PASS
ok      github.com/hashicorp/terraform-provider-aws/internal/service/transfer   82.493s
```