[Snyk] Security upgrade gatsby-plugin-mdx from 2.14.2 to 4.0.0

[nr-security-github]

Snyk has created this PR to fix one or more vulnerable packages in the `yarn` dependencies of this project.

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • package.json
  • yarn.lock

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Breaking Change	Exploit Maturity
	661/1000 Why? Recently disclosed, Has a fix available, CVSS 7.5	Prototype Pollution SNYK-JS-LOADERUTILS-3043105	Yes	No Known Exploit

(*) Note that the real score may have changed since the PR was raised.

Check the changes in this PR to ensure they won't cause issues with your project.

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🦉 Prototype Pollution

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Errors

There was an error in your GraphQL query:

Value "frontmatter___startDate" does not exist in "MdxFieldsEnum" enum.

There was an error in your GraphQL query:

Field "fileAbsolutePath" is not defined by type "MdxFilterInput".