Bump percy from 0.28.6 to 0.28.7

Bumps [percy](https://github.com/percy/percy-agent) from 0.28.6 to 0.28.7.
- [Release notes](https://github.com/percy/percy-agent/releases)
- [Changelog](https://github.com/percy/percy-agent/blob/master/CHANGELOG.md)
- [Commits](https://github.com/percy/percy-agent/commits)

---
updated-dependencies:
- dependency-name: percy
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package.json

@@ -40,7 +40,7 @@
     "npm-run-all": "4.1.5",
     "parcel": "2.0.0-beta.3.1",
     "parcel-plugin-bundle-visualiser": "1.2.0",
-    "percy": "0.28.6",
+    "percy": "0.28.7",
     "postcss": "8.4.12",
     "postcss-cli": "9.0.2",
     "posthtml-expressions": "1.9.0",