Update snapshots in custom_scalar_map.rs

[DaleSeo]

This PR follows up on #272 (comment) and updates all remaining inline snapshots in the codebase to ensure they are consistent with the latest insta format. The insta crate in the xtask crate has also been bumped to 1.43.1.

https://insta.rs/changelog/#1-40-0

[apollo-librarian]

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File Changes

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* (developer-tools)/apollo-mcp-server/(latest)/best-practices.mdx
* (developer-tools)/apollo-mcp-server/(latest)/command-reference.mdx
* (developer-tools)/apollo-mcp-server/(latest)/index.mdx
* (developer-tools)/apollo-mcp-server/(latest)/install.mdx
* (developer-tools)/apollo-mcp-server/(latest)/limitations.mdx
* (developer-tools)/apollo-mcp-server/(latest)/quickstart.mdx
* (developer-tools)/apollo-mcp-server/(latest)/guides/index.mdx

Build ID: 2f49e83d761889dd0f9278de
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URL: https://www.apollographql.com/docs/deploy-preview/2f49e83d761889dd0f9278de

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