Bumps [gatsby-source-filesystem](https://github.com/gatsbyjs/gatsby/tree/HEAD/packages/gatsby-source-filesystem) from 2.4.2 to 2.5.0. - [Release notes](https://github.com/gatsbyjs/gatsby/releases) - [Changelog](https://github.com/gatsbyjs/gatsby/blob/master/packages/gatsby-source-filesystem/CHANGELOG.md) - [Commits](https://github.com/gatsbyjs/gatsby/commits/gatsby-source-filesystem@2.5.0/packages/gatsby-source-filesystem) Signed-off-by: dependabot[bot] <support@github.com>