chore(deps-dev): bump nodemon from 2.0.20 to 2.0.21

Bumps [nodemon](https://github.com/remy/nodemon) from 2.0.20 to 2.0.21.
- [Release notes](https://github.com/remy/nodemon/releases)
- [Commits](remy/nodemon@v2.0.20...v2.0.21)

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

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

package.json

@@ -22,7 +22,7 @@
     "firebase-tools": "^11.24.0",
     "markdown-it-anchor": "^8.6.7",
     "markdown-it-attrs": "^4.1.6",
-    "nodemon": "^2.0.20",
+    "nodemon": "^2.0.21",
     "pascal-case": "^3.1.2",
     "postcss": "^8.4.21",
     "postcss-cli": "^10.1.0",