build(deps): bump gatsby-transformer-yaml from 5.11.0 to 5.12.0

Bumps [gatsby-transformer-yaml](https://github.com/gatsbyjs/gatsby/tree/HEAD/packages/gatsby-transformer-yaml) from 5.11.0 to 5.12.0.
- [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/[email protected]/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] <[email protected]>

package.json

@@ -121,7 +121,7 @@
     "gatsby-transformer-javascript-frontmatter": "~5.11.0",
     "gatsby-transformer-json": "~5.11.0",
     "gatsby-transformer-remark": "~6.11.0",
-    "gatsby-transformer-yaml": "~5.11.0",
+    "gatsby-transformer-yaml": "~5.12.0",
     "github-slugger": "~2.0.0",
     "got": "~11.8.6",
     "humanize-url": "~3.0.0",