fix: upgrade @splitsoftware/splitio-react from 1.2.1 to 1.2.4

Snyk has created this PR to upgrade @splitsoftware/splitio-react from 1.2.1 to 1.2.4.

See this package in npm:
https://www.npmjs.com/package/@splitsoftware/splitio-react

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

@@ -10,7 +10,7 @@
     "@mdx-js/mdx": "^1.6.19",
     "@mdx-js/react": "^1.6.19",
     "@newrelic/gatsby-theme-newrelic": "^1.16.3",
-    "@splitsoftware/splitio-react": "^1.2.1",
+    "@splitsoftware/splitio-react": "^1.2.4",
     "date-fns": "^2.14.0",
     "feather-icons": "^4.28.0",
     "gatsby": "^2.24.91",