Bump gatsby-plugin-offline from 4.7.1 to 4.8.0

Bumps [gatsby-plugin-offline](https://github.com/gatsbyjs/gatsby/tree/HEAD/packages/gatsby-plugin-offline) from 4.7.1 to 4.8.0.
- [Release notes](https://github.com/gatsbyjs/gatsby/releases)
- [Changelog](https://github.com/gatsbyjs/gatsby/blob/master/packages/gatsby-plugin-offline/CHANGELOG.md)
- [Commits](https://github.com/gatsbyjs/gatsby/commits/gatsby-plugin-offline@4.8.0/packages/gatsby-plugin-offline)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Author: dependabot-preview[bot]

package-lock.json

@@ -26,7 +26,7 @@
     "carraway": "^1.0.44",
     "gatsby": "^2.32.13",
     "gatsby-plugin-manifest": "^2.12.1",
-    "gatsby-plugin-offline": "^4.7.1",
+    "gatsby-plugin-offline": "^4.8.0",
     "gatsby-theme-atom-service": "^1.1.296",
     "react": "^17.0.2",
     "react-dom": "^17.0.2"