fix: upgrade gatsby-plugin-matomo from 0.16.0 to 0.16.1 (#6)

Snyk has created this PR to upgrade gatsby-plugin-matomo from 0.16.0 to 0.16.1.

See this package in npm:
https://www.npmjs.com/package/gatsby-plugin-matomo

See this project in Snyk:
https://app.snyk.io/org/sammyfilly/project/cc19e96e-4083-4d24-ae8b-ddbc58138043?utm_source=github&utm_medium=referral&page=upgrade-pr

Co-authored-by: snyk-bot <snyk-bot@snyk.io>

package.json

@@ -25,7 +25,7 @@
     "gatsby": "^5.11.0",
     "gatsby-plugin-catch-links": "^5.11.0",
     "gatsby-plugin-htaccess": "^1.4.0",
-    "gatsby-plugin-matomo": "^0.16.0",
+    "gatsby-plugin-matomo": "^0.16.1",
     "gatsby-remark-autolink-headers": "^6.11.0",
     "gatsby-remark-katex": "^7.11.0",
     "gatsby-remark-numbered-footnotes": "^1.0.1",