Bump http-cache-semantics and gatsby

Bumps [http-cache-semantics](https://github.com/kornelski/http-cache-semantics) to 4.1.1 and updates ancestor dependency [gatsby](https://github.com/gatsbyjs/gatsby). These dependencies need to be updated together.


Updates `http-cache-semantics` from 3.8.1 to 4.1.1
- [Release notes](https://github.com/kornelski/http-cache-semantics/releases)
- [Commits](https://github.com/kornelski/http-cache-semantics/compare/v3.8.1...v4.1.1)

Updates `gatsby` from 2.17.6 to 5.9.0
- [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@2.17.6...gatsby@5.9.0)

---
updated-dependencies:
- dependency-name: http-cache-semantics
  dependency-type: indirect
- dependency-name: gatsby
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -5,14 +5,14 @@
   "version": "0.1.0",
   "author": "Kyle Mathews <mathews.kyle@gmail.com>",
   "dependencies": {
-    "gatsby": "^2.17.6",
+    "gatsby": "^5.9.0",
     "gatsby-image": "^2.2.30",
     "gatsby-plugin-manifest": "^2.2.25",
     "gatsby-plugin-offline": "^3.0.17",
     "gatsby-plugin-react-helmet": "^3.1.13",
     "gatsby-plugin-sharp": "^4.25.1",
     "gatsby-source-filesystem": "^2.1.35",
-    "gatsby-transformer-sharp": "^2.12.1",
+    "gatsby-transformer-sharp": "^2.3.1",
     "prop-types": "^15.7.2",
     "react": "^16.11.0",
     "react-dom": "^16.11.0",