chore: bump github.com/anthropics/anthropic-sdk-go from 1.17.0 to 1.18.0 (#20795)

Bumps
[github.com/anthropics/anthropic-sdk-go](https://github.com/anthropics/anthropic-sdk-go)
from 1.17.0 to 1.18.0.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/anthropics/anthropic-sdk-go/releases">github.com/anthropics/anthropic-sdk-go's
releases</a>.</em></p>
<blockquote>
<h2>v1.18.0</h2>
<h2>1.18.0 (2025-11-14)</h2>
<p>Full Changelog: <a
href="https://github.com/anthropics/anthropic-sdk-go/compare/v1.17.0...v1.18.0">v1.17.0...v1.18.0</a></p>
<h3>Features</h3>
<ul>
<li><strong>api:</strong> add support for structured outputs beta (<a
href="https://github.com/anthropics/anthropic-sdk-go/commit/fb9cfb4e4b571d5fec7da9874610aa8820aee80c">fb9cfb4</a>)</li>
</ul>
<h3>Chores</h3>
<ul>
<li>bump gjson version (<a
href="https://github.com/anthropics/anthropic-sdk-go/commit/69b5e0e40757884bece66397fb6ca769f4e00118">69b5e0e</a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/anthropics/anthropic-sdk-go/blob/main/CHANGELOG.md">github.com/anthropics/anthropic-sdk-go's
changelog</a>.</em></p>
<blockquote>
<h2>1.18.0 (2025-11-14)</h2>
<p>Full Changelog: <a
href="https://github.com/anthropics/anthropic-sdk-go/compare/v1.17.0...v1.18.0">v1.17.0...v1.18.0</a></p>
<h3>Features</h3>
<ul>
<li><strong>api:</strong> add support for structured outputs beta (<a
href="https://github.com/anthropics/anthropic-sdk-go/commit/fb9cfb4e4b571d5fec7da9874610aa8820aee80c">fb9cfb4</a>)</li>
</ul>
<h3>Chores</h3>
<ul>
<li>bump gjson version (<a
href="https://github.com/anthropics/anthropic-sdk-go/commit/69b5e0e40757884bece66397fb6ca769f4e00118">69b5e0e</a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/anthropics/anthropic-sdk-go/commit/f4266c4d6cb52f0efd239777f322db2387168334"><code>f4266c4</code></a>
release: 1.18.0</li>
<li><a
href="https://github.com/anthropics/anthropic-sdk-go/commit/e3776089b6095d27726c31d82a8e2c9f12bd0cf1"><code>e377608</code></a>
feat(api): add support for structured outputs beta</li>
<li><a
href="https://github.com/anthropics/anthropic-sdk-go/commit/fc01187b262243230c5f5a89c08d835d65b17c6d"><code>fc01187</code></a>
codegen metadata</li>
<li><a
href="https://github.com/anthropics/anthropic-sdk-go/commit/4e9c5a8a928a43e81a133a18ef0396907d833c6a"><code>4e9c5a8</code></a>
codegen metadata</li>
<li>See full diff in <a
href="https://github.com/anthropics/anthropic-sdk-go/compare/v1.17.0...v1.18.0">compare
view</a></li>
</ul>
</details>
<br />


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go.mod

@@ -473,7 +473,7 @@ require (
 )
 
 require (
-	github.com/anthropics/anthropic-sdk-go v1.17.0
+	github.com/anthropics/anthropic-sdk-go v1.18.0
 	github.com/brianvoe/gofakeit/v7 v7.9.0
 	github.com/coder/agentapi-sdk-go v0.0.0-20250505131810-560d1d88d225
 	github.com/coder/aibridge v0.1.7

go.sum

@@ -726,8 +726,8 @@ github.com/andybalholm/brotli v1.2.0 h1:ukwgCxwYrmACq68yiUqwIWnGY0cTPox/M94sVwTo
 github.com/andybalholm/brotli v1.2.0/go.mod h1:rzTDkvFWvIrjDXZHkuS16NPggd91W3kUSvPlQ1pLaKY=
 github.com/anmitsu/go-shlex v0.0.0-20200514113438-38f4b401e2be h1:9AeTilPcZAjCFIImctFaOjnTIavg87rW78vTPkQqLI8=
 github.com/anmitsu/go-shlex v0.0.0-20200514113438-38f4b401e2be/go.mod h1:ySMOLuWl6zY27l47sB3qLNK6tF2fkHG55UZxx8oIVo4=
-github.com/anthropics/anthropic-sdk-go v1.17.0 h1:BwK8ApcmaAUkvZTiQE0yi3R9XneEFskDIjLTmOAFZxQ=
-github.com/anthropics/anthropic-sdk-go v1.17.0/go.mod h1:WTz31rIUHUHqai2UslPpw5CwXrQP3geYBioRV4WOLvE=
+github.com/anthropics/anthropic-sdk-go v1.18.0 h1:jfxRA7AqZoCm83nHO/OVQp8xuwjUKtBziEdMbfmofHU=
+github.com/anthropics/anthropic-sdk-go v1.18.0/go.mod h1:WTz31rIUHUHqai2UslPpw5CwXrQP3geYBioRV4WOLvE=
 github.com/antihax/optional v1.0.0/go.mod h1:uupD/76wgC+ih3iEmQUL+0Ugr19nfwCT1kdvxnR2qWY=
 github.com/apache/arrow/go/v10 v10.0.1/go.mod h1:YvhnlEePVnBS4+0z3fhPfUy7W1Ikj0Ih0vcRo/gZ1M0=
 github.com/apache/arrow/go/v11 v11.0.0/go.mod h1:Eg5OsL5H+e299f7u5ssuXsuHQVEGC4xei5aX110hRiI=