fix: upgrade multiple dependencies with Snyk

Snyk has created this PR to upgrade:
  - gatsby-image from 2.4.9 to 2.4.11.
    See this package in npm: https://www.npmjs.com/package/gatsby-image
  - gatsby-plugin-sharp from 2.6.14 to 2.6.16.
    See this package in npm: https://www.npmjs.com/package/gatsby-plugin-sharp
  - gatsby-transformer-sharp from 2.5.7 to 2.5.9.
    See this package in npm: https://www.npmjs.com/package/gatsby-transformer-sharp

See this project in Snyk:
https://app.snyk.io/org/github-newrelic/project/868cac7a-942a-4cb5-a87b-05381c8ca7ec?utm_source=github&utm_medium=upgrade-pr

package.json

@@ -12,7 +12,7 @@
     "date-fns": "^2.14.0",
     "eslint-plugin-react-hooks": "^4.0.5",
     "gatsby": "^2.24.2",
-    "gatsby-image": "^2.4.9",
+    "gatsby-image": "^2.4.11",
     "gatsby-plugin-emotion": "^4.3.9",
     "gatsby-plugin-layout": "^1.3.10",
     "gatsby-plugin-manifest": "^2.4.12",
@@ -22,13 +22,13 @@
     "gatsby-plugin-react-helmet": "^3.3.4",
     "gatsby-plugin-robots-txt": "^1.5.1",
     "gatsby-plugin-sass": "^2.3.4",
-    "gatsby-plugin-sharp": "^2.6.14",
+    "gatsby-plugin-sharp": "^2.6.16",
     "gatsby-plugin-sitemap": "^2.4.5",
     "gatsby-plugin-use-dark-mode": "^1.1.2",
     "gatsby-remark-images": "^3.3.11",
     "gatsby-source-filesystem": "^2.3.12",
     "gatsby-transformer-remark": "^2.8.17",
-    "gatsby-transformer-sharp": "^2.5.7",
+    "gatsby-transformer-sharp": "^2.5.9",
     "js-cookie": "^2.2.1",
     "node-sass": "^4.14.1",
     "prism-react-renderer": "^1.1.1",