Update dependency prism-react-renderer to v1.2.1

Author: renovate-bot

package.json

@@ -24,7 +24,7 @@
     "gatsby-source-filesystem": "2.3.28",
     "gatsby-theme-essentials": "https://github.com/universse/gatsby-theme-essentials",
     "mdx-utils": "0.2.0",
-    "prism-react-renderer": "1.1.1",
+    "prism-react-renderer": "1.2.1",
     "prop-types": "15.7.2",
     "react": "16.13.1",
     "react-dom": "16.13.1",