build(deps-dev): bump nodemon from 2.0.18 to 2.0.20

Bumps [nodemon](https://github.com/remy/nodemon) from 2.0.18 to 2.0.20.
- [Release notes](https://github.com/remy/nodemon/releases)
- [Commits](remy/nodemon@v2.0.18...v2.0.20)

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

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

Author: dependabot[bot]

package-lock.json

@@ -78,7 +78,7 @@
     "html5-boilerplate": "^8.0.0",
     "husky": "^7.0.4",
     "iframe-resizer": "^4.3.2",
-    "nodemon": "^2.0.15",
+    "nodemon": "^2.0.20",
     "npm-run-all": "^4.1.5",
     "pa11y-ci": "^3.0.1",
     "postcss": "^8.4.12",