Update module github.com/aws/smithy-go to v1.27.4 (#189)

This PR contains the following updates:

| Package | Change |
[Age](https://docs.renovatebot.com/merge-confidence/) |
[Confidence](https://docs.renovatebot.com/merge-confidence/) |
|---|---|---|---|
| [github.com/aws/smithy-go](https://redirect.github.com/aws/smithy-go)
| `v1.27.0` → `v1.27.4` |
![age](https://developer.mend.io/api/mc/badges/age/go/github.com%2faws%2fsmithy-go/v1.27.4?slim=true)
|
![confidence](https://developer.mend.io/api/mc/badges/confidence/go/github.com%2faws%2fsmithy-go/v1.27.0/v1.27.4?slim=true)
|

---

### Release Notes

<details>
<summary>aws/smithy-go (github.com/aws/smithy-go)</summary>

###
[`v1.27.4`](https://redirect.github.com/aws/smithy-go/compare/v1.27.3...v1.27.4)

[Compare
Source](https://redirect.github.com/aws/smithy-go/compare/v1.27.3...v1.27.4)

###
[`v1.27.3`](https://redirect.github.com/aws/smithy-go/blob/HEAD/CHANGELOG.md#Release-2026-06-26)

[Compare
Source](https://redirect.github.com/aws/smithy-go/compare/v1.27.2...v1.27.3)

#### General Highlights

- **Dependency Update**: Updated to the latest SDK module versions

#### Module Highlights

- `github.com/aws/smithy-go`: v1.27.3
- **Bug Fix**: Fix bug in JSON doc encoder and endpoint host label
format validation

###
[`v1.27.2`](https://redirect.github.com/aws/smithy-go/blob/HEAD/CHANGELOG.md#Release-2026-06-05)

[Compare
Source](https://redirect.github.com/aws/smithy-go/compare/v1.27.1...v1.27.2)

#### General Highlights

- **Dependency Update**: Updated to the latest SDK module versions

#### Module Highlights

- `github.com/aws/smithy-go`: v1.27.2
- **Bug Fix**: Fix incorrect serialization of unions in CBOR-based
protocols.

###
[`v1.27.1`](https://redirect.github.com/aws/smithy-go/blob/HEAD/CHANGELOG.md#Release-2026-06-04)

[Compare
Source](https://redirect.github.com/aws/smithy-go/compare/v1.27.0...v1.27.1)

#### General Highlights

- **Dependency Update**: Updated to the latest SDK module versions

#### Module Highlights

- `github.com/aws/smithy-go`: v1.27.1
- **Bug Fix**: Fixed a deserialization failure in all protocols when
encountering a union with explicit null members.
- **Bug Fix**: Fixed a panic when deserializing nested unions in JSON-
and CBOR-based protocols.

</details>

---

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---

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go.mod

@@ -71,7 +71,7 @@ require (
 	github.com/aws/aws-sdk-go-v2/service/sso v1.30.19 // indirect
 	github.com/aws/aws-sdk-go-v2/service/ssooidc v1.36.2 // indirect
 	github.com/aws/aws-sdk-go-v2/service/sts v1.42.3 // indirect
-	github.com/aws/smithy-go v1.27.0 // indirect
+	github.com/aws/smithy-go v1.27.4 // indirect
 	github.com/aymanbagabas/go-osc52/v2 v2.0.1 // indirect
 	github.com/beorn7/perks v1.0.1 // indirect
 	github.com/bgentry/go-netrc v0.0.0-20140422174119-9fd32a8b3d3d // indirect

go.sum

@@ -2852,8 +2852,8 @@ github.com/aws/smithy-go v1.13.5/go.mod h1:Tg+OJXh4MB2R/uN61Ko2f6hTZwB/ZYGOtib8J
 github.com/aws/smithy-go v1.20.1/go.mod h1:krry+ya/rV9RDcV/Q16kpu6ypI4K2czasz0NC3qS14E=
 github.com/aws/smithy-go v1.22.2/go.mod h1:irrKGvNn1InZwb2d7fkIRNucdfwR8R+Ts3wxYa/cJHg=
 github.com/aws/smithy-go v1.22.3/go.mod h1:t1ufH5HMublsJYulve2RKmHDC15xu1f26kHCp/HgceI=
-github.com/aws/smithy-go v1.27.0 h1:ZoFioDKJxkSIW2otF9T0aPtNlUwhdVCcuZh/rzH9Hus=
-github.com/aws/smithy-go v1.27.0/go.mod h1:YE2RhdIuDbA5E5bTdciG9KrW3+TiEONeUWCqxX9i1Fc=
+github.com/aws/smithy-go v1.27.4 h1:JQcphmBN4f0q/sPqXqROIItRNV/hy10cgu7CsFy616M=
+github.com/aws/smithy-go v1.27.4/go.mod h1:YE2RhdIuDbA5E5bTdciG9KrW3+TiEONeUWCqxX9i1Fc=
 github.com/aymanbagabas/go-osc52/v2 v2.0.1 h1:HwpRHbFMcZLEVr42D4p7XBqjyuxQH5SMiErDT4WkJ2k=
 github.com/aymanbagabas/go-osc52/v2 v2.0.1/go.mod h1:uYgXzlJ7ZpABp8OJ+exZzJJhRNQ2ASbcXHWsFqH8hp8=
 github.com/bazelbuild/buildtools v0.0.0-20260211083412-859bfffeef82 h1:PmoVmwzAnGb0iCjulb7Mgsaqw2Wj36LQJ8VyYaFe/ak=