bump gatsby-plugin-google-gtag from 5.12.0 to 5.12.3 (#907)

---
updated-dependencies:
- dependency-name: gatsby-plugin-google-gtag
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

package.json

@@ -22,7 +22,7 @@
  "flexsearch": "^0.7.31",
  "gatsby": "^5.12.4",
  "gatsby-plugin-feed": "^5.12.0",
- "gatsby-plugin-google-gtag": "^5.12.0",
+ "gatsby-plugin-google-gtag": "^5.12.3",
  "gatsby-plugin-google-tagmanager": "^5.12.0",
  "gatsby-plugin-image": "^3.12.0",
  "gatsby-plugin-local-search": "^2.0.1",