chore(deps): bump tmp and gatsby (#818)

Bumps [tmp](https://github.com/raszi/node-tmp) to 0.2.4 and updates ancestor dependency [gatsby](https://github.com/gatsbyjs/gatsby). These dependencies need to be updated together.


Updates `tmp` from 0.2.1 to 0.2.4
- [Changelog](https://github.com/raszi/node-tmp/blob/master/CHANGELOG.md)
- [Commits](raszi/node-tmp@v0.2.1...v0.2.4)

Updates `gatsby` from 5.14.5 to 5.14.6
- [Release notes](https://github.com/gatsbyjs/gatsby/releases)
- [Changelog](https://github.com/gatsbyjs/gatsby/blob/master/CHANGELOG.md)
- [Commits](https://github.com/gatsbyjs/gatsby/compare/gatsby@5.14.5...gatsby@5.14.6)

---
updated-dependencies:
- dependency-name: tmp
  dependency-version: 0.2.4
  dependency-type: indirect
- dependency-name: gatsby
  dependency-version: 5.14.6
  dependency-type: direct:production
...

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Author: dependabot[bot]