Bump coveralls from 3.0.7 to 3.0.9

Bumps [coveralls](https://github.com/nickmerwin/node-coveralls) from 3.0.7 to 3.0.9.
- [Release notes](https://github.com/nickmerwin/node-coveralls/releases)
- [Commits](https://github.com/nickmerwin/node-coveralls/commits/3.0.9)

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

package.json

@@ -55,7 +55,7 @@
     "chaikin-smooth": "^1.0.4",
     "clean-css-cli": "4.3.0",
     "copy-webpack-plugin": "^5.0.4",
-    "coveralls": "3.0.7",
+    "coveralls": "3.0.9",
     "eslint": "^6.0.0",
     "eslint-config-openlayers": "^13.0.0",
     "expect.js": "0.3.1",