fix: upgrade prism-react-renderer from 1.1.1 to 1.2.0

Snyk has created this PR to upgrade prism-react-renderer from 1.1.1 to 1.2.0.

See this package in npm:
https://www.npmjs.com/package/prism-react-renderer

See this project in Snyk:
https://app.snyk.io/org/github-newrelic/project/f888c3c2-125f-4ff7-a0c6-0181b3c27c8b?utm_source=github&utm_medium=upgrade-pr

Author: snyk-bot

package-lock.json

@@ -30,7 +30,7 @@
     "lodash": "^4.17.20",
     "marked": "^1.1.1",
     "node-sass": "^4.14.1",
-    "prism-react-renderer": "^1.1.1",
+    "prism-react-renderer": "^1.2.0",
     "prop-types": "^15.7.2",
     "react": "^16.12.0",
     "react-dom": "^16.12.0",