Bump markdown-to-jsx from 7.1.7 to 7.1.8 (#315)

Bumps [markdown-to-jsx](https://github.com/probablyup/markdown-to-jsx) from 7.1.7 to 7.1.8.
- [Release notes](https://github.com/probablyup/markdown-to-jsx/releases)
- [Commits](quantizor/markdown-to-jsx@v7.1.7...v7.1.8)

---
updated-dependencies:
- dependency-name: markdown-to-jsx
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

package-lock.json

@@ -26,7 +26,7 @@
     "gatsby-transformer-json": "^2.11.0",
     "gatsby-transformer-remark": "^2.16.1",
     "gatsby-transformer-sharp": "^2.12.1",
-    "markdown-to-jsx": "^7.1.7",
+    "markdown-to-jsx": "^7.1.8",
     "netlify-cms-app": "^2.15.72",
     "netlify-cms-media-library-cloudinary": "^1.3.10",
     "prismjs": "^1.29.0",