Bump gatsby-source-filesystem from 1.5.27 to 1.5.39
Bump gatsby-source-filesystem from 1.5.27 to 1.5.39

Bumps [gatsby-source-filesystem](https://github.com/gatsbyjs/gatsby) from 1.5.27 to 1.5.39.
- [Release notes](https://github.com/gatsbyjs/gatsby/releases)
- [Changelog](https://github.com/gatsbyjs/gatsby/blob/master/CHANGELOG.md)
- [Commits](https://github.com/gatsbyjs/gatsby/commits)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
jbhannah/jbhannah.net,jbhannah/jbhannah.net