Bump gatsby-plugin-sharp from 2.6.2 to 4.25.1

Bumps [gatsby-plugin-sharp](https://github.com/gatsbyjs/gatsby/tree/HEAD/packages/gatsby-plugin-sharp) from 2.6.2 to 4.25.1.
- [Release notes](https://github.com/gatsbyjs/gatsby/releases)
- [Changelog](https://github.com/gatsbyjs/gatsby/blob/master/packages/gatsby-plugin-sharp/CHANGELOG.md)
- [Commits](https://github.com/gatsbyjs/gatsby/commits/gatsby-plugin-sharp@4.25.1/packages/gatsby-plugin-sharp)

---
updated-dependencies:
- dependency-name: gatsby-plugin-sharp
  dependency-type: direct:production
...

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

www/package.json

@@ -10,7 +10,7 @@
     "gatsby-plugin-offline": "3.2.1",
     "gatsby-plugin-postcss": "2.3.1",
     "gatsby-plugin-react-helmet": "3.3.1",
-    "gatsby-plugin-sharp": "2.6.2",
+    "gatsby-plugin-sharp": "4.25.1",
     "react": "16.13.1",
     "react-chartkick": "^0.4.0",
     "react-dom": "16.13.1",