deps: bump gatsby-transformer-yaml from 5.12.0 to 5.13.0 (#885)

Bumps [gatsby-transformer-yaml](https://github.com/gatsbyjs/gatsby/tree/HEAD/packages/gatsby-transformer-yaml) from 5.12.0 to 5.13.0. - [Release notes](https://github.com/gatsbyjs/gatsby/releases) - [Changelog](https://github.com/gatsbyjs/gatsby/blob/master/packages/gatsby-transformer-yaml/CHANGELOG.md) - [Commits](https://github.com/gatsbyjs/gatsby/commits/gatsby-transformer-yaml@5.13.0/packages/gatsby-transformer-yaml) --- updated-dependencies: - dependency-name: gatsby-transformer-yaml dependency-type: direct:production update-type: version-update:semver-minor ... Signed-off-by: dependabot[bot] <support@github.com> Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>