chore(deps): bump langsmith from 0.5.4 to 0.5.20 in /docs/en/documentation/configuration/pre-post-processing/js/langchain (#3070)

Bumps [langsmith](https://github.com/langchain-ai/langsmith-sdk) from
0.5.4 to 0.5.20.
<details>
<summary>Commits</summary>
<ul>
<li>See full diff in <a
href="https://github.com/langchain-ai/langsmith-sdk/commits">compare
view</a></li>
</ul>
</details>
<details>
<summary>Install script changes</summary>
<p>This version modifies <code>prepublish</code> script that runs during
installation. Review the package contents before updating.</p>
</details>
<br />

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Yuan Teoh <45984206+Yuan325@users.noreply.github.com>

Author: dependabot[bot]