deps: github.com/aws/aws-sdk-go@v1.30.12

Reference: #24710
Reference: #24741

Changes:

```
NOTES:

* backend/s3: Region validation now automatically supports the new `af-south-1` (Africa (Cape Town)) region. For AWS operations to work in the new region, the region must be explicitly enabled as outlined in the [AWS Documentation](https://docs.aws.amazon.com/general/latest/gr/rande-manage.html#rande-manage-enable). When the region is not enabled, the Terraform S3 Backend will return errors during credential validation (e.g. `error validating provider credentials: error calling sts:GetCallerIdentity: InvalidClientTokenId: The security token included in the request is invalid`).

ENHANCEMENTS:

* backend/s3: Support automatic region validation for `af-south-1`
* backend/s3: Support Client Side Metrics (CSM) options from shared configuration file
* backend/s3: Support IAM Roles for Service Accounts (IRSA) via `AWS_ROLE_ARN` and `AWS_WEB_IDENTITY_TOKEN_FILE` environment variables
```

Updated via:

```console
$ go get github.com/aws/aws-sdk-go@v1.30.12
$ go mod tidy
$ go mod vendor
```

Output from acceptance testing:

```console
$ TF_ACC=1 go test -v ./backend/remote-state/s3 | grep '^--- '
--- PASS: TestBackend_impl (0.00s)
--- PASS: TestBackendConfig (1.68s)
--- PASS: TestBackendConfig_invalidKey (0.00s)
--- PASS: TestBackendConfig_invalidSSECustomerKeyLength (0.00s)
--- PASS: TestBackendConfig_invalidSSECustomerKeyEncoding (0.00s)
--- PASS: TestBackendConfig_conflictingEncryptionSchema (0.00s)
--- PASS: TestBackend (15.07s)
--- PASS: TestBackendLocked (26.40s)
--- PASS: TestBackendSSECustomerKey (16.99s)
--- PASS: TestBackendExtraPaths (12.05s)
--- PASS: TestBackendPrefixInWorkspace (5.55s)
--- PASS: TestKeyEnv (45.07s)
--- PASS: TestRemoteClient_impl (0.00s)
--- PASS: TestRemoteClient (5.39s)
--- PASS: TestRemoteClientLocks (14.30s)
--- PASS: TestForceUnlock (20.08s)
--- PASS: TestRemoteClient_clientMD5 (16.43s)
--- PASS: TestRemoteClient_stateChecksum (24.58s)
```

go.mod

@@ -18,7 +18,7 @@ require (
 	github.com/armon/circbuf v0.0.0-20190214190532-5111143e8da2
 	github.com/armon/go-metrics v0.0.0-20180917152333-f0300d1749da // indirect
 	github.com/armon/go-radix v1.0.0 // indirect
-	github.com/aws/aws-sdk-go v1.30.9
+	github.com/aws/aws-sdk-go v1.30.12
 	github.com/baiyubin/aliyun-sts-go-sdk v0.0.0-20180326062324-cfa1a18b161f // indirect
 	github.com/blang/semver v3.5.1+incompatible
 	github.com/bmatcuk/doublestar v1.1.5

go.sum

@@ -86,8 +86,8 @@ github.com/armon/go-radix v1.0.0/go.mod h1:ufUuZ+zHj4x4TnLV4JWEpy2hxWSpsRywHrMgI
 github.com/aws/aws-sdk-go v1.15.78/go.mod h1:E3/ieXAlvM0XWO57iftYVDLLvQ824smPP3ATZkfNZeM=
 github.com/aws/aws-sdk-go v1.25.3 h1:uM16hIw9BotjZKMZlX05SN2EFtaWfi/NonPKIARiBLQ=
 github.com/aws/aws-sdk-go v1.25.3/go.mod h1:KmX6BPdI08NWTb3/sm4ZGu5ShLoqVDhKgpiN924inxo=
-github.com/aws/aws-sdk-go v1.30.9 h1:DntpBUKkchINPDbhEzDRin1eEn1TG9TZFlzWPf0i8to=
-github.com/aws/aws-sdk-go v1.30.9/go.mod h1:5zCpMtNQVjRREroY7sYe8lOMRSxkhG6MZveU8YkpAk0=
+github.com/aws/aws-sdk-go v1.30.12 h1:KrjyosZvkpJjcwMk0RNxMZewQ47v7+ZkbQDXjWsJMs8=
+github.com/aws/aws-sdk-go v1.30.12/go.mod h1:5zCpMtNQVjRREroY7sYe8lOMRSxkhG6MZveU8YkpAk0=
 github.com/baiyubin/aliyun-sts-go-sdk v0.0.0-20180326062324-cfa1a18b161f h1:ZNv7On9kyUzm7fvRZumSyy/IUiSC7AzL0I1jKKtwooA=
 github.com/baiyubin/aliyun-sts-go-sdk v0.0.0-20180326062324-cfa1a18b161f/go.mod h1:AuiFmCCPBSrqvVMvuqFuk0qogytodnVFVSN5CeJB8Gc=
 github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973 h1:xJ4a3vCFaGF/jqvzLMYoU8P317H5OQ+Via4RmuPwCS0=