fix: upgrade @mdx-js/react from 1.6.18 to 1.6.19

Snyk has created this PR to upgrade @mdx-js/react from 1.6.18 to 1.6.19.

See this package in npm:


See this project in Snyk:
https://app.snyk.io/org/github-newrelic/project/ee280047-f651-440a-aaec-462aac2b4fe2?utm_source=github&utm_medium=upgrade-pr

package.json

@@ -6,7 +6,7 @@
     "@emotion/core": "^10.0.35",
     "@emotion/styled": "^10.0.27",
     "@mdx-js/mdx": "^1.6.17",
-    "@mdx-js/react": "^1.6.18",
+    "@mdx-js/react": "^1.6.19",
     "@newrelic/gatsby-theme-newrelic": "^1.14.0",
     "@splitsoftware/splitio-react": "^1.2.0",
     "@xstate/react": "^1.0.1",

yarn.lock

@@ -2961,11 +2961,16 @@
     unist-builder "2.0.3"
     unist-util-visit "2.0.3"
 
-"@mdx-js/react@^1.5.2", "@mdx-js/react@^1.6.18":
+"@mdx-js/react@^1.5.2":
   version "1.6.18"
   resolved "https://registry.yarnpkg.com/@mdx-js/react/-/react-1.6.18.tgz#f83cbb2355de9cf36a213140ce21647da1e34fa7"
   integrity sha512-aFHsZVu7r9WamlP+WO/lyvHHZAubkQjkcRYlvS7fQElypfJvjKdHevjC3xiqlsQpasx/4KqRMoEIb++wNtd+6w==
 
+"@mdx-js/react@^1.6.19":
+  version "1.6.21"
+  resolved "https://registry.yarnpkg.com/@mdx-js/react/-/react-1.6.21.tgz#86d962471a5e160c59a6b32054aa55c0c7ca404e"
+  integrity sha512-CgSNT9sq2LAlhEbVlPg7DwUQkypz+CWaWGcJbkgmp9WCAy6vW33CQ44UbKPiH3wet9o+UbXeQOqzZd041va83g==
+
 "@mdx-js/react@^2.0.0-next.4", "@mdx-js/react@^2.0.0-next.8":
   version "2.0.0-next.8"
   resolved "https://registry.yarnpkg.com/@mdx-js/react/-/react-2.0.0-next.8.tgz#fa774dc781600eb075513eebaae6bd705776ac34"