build(deps): bump @braintree/sanitize-url and gatsby-remark-mermaid

Bumps [@braintree/sanitize-url](https://github.com/braintree/sanitize-url) to 6.0.2 and updates ancestor dependency [gatsby-remark-mermaid](https://github.com/remcohaszing/gatsby-remark-mermaid). These dependencies need to be updated together.


Updates `@braintree/sanitize-url` from 3.1.0 to 6.0.2
- [Release notes](https://github.com/braintree/sanitize-url/releases)
- [Changelog](https://github.com/braintree/sanitize-url/blob/main/CHANGELOG.md)
- [Commits](braintree/sanitize-url@v3.1.0...v6.0.2)

Updates `gatsby-remark-mermaid` from 2.1.0 to 3.0.1
- [Release notes](https://github.com/remcohaszing/gatsby-remark-mermaid/releases)
- [Commits](remcohaszing/gatsby-remark-mermaid@v2.1.0...v3.0.1)

---
updated-dependencies:
- dependency-name: "@braintree/sanitize-url"
  dependency-type: indirect
- dependency-name: gatsby-remark-mermaid
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>