Bump braces, @microsoft/sp-build-web and gulp in /samples/react-quotes

Bumps [braces](https://github.com/micromatch/braces) to 3.0.3 and updates ancestor dependencies [braces](https://github.com/micromatch/braces), [@microsoft/sp-build-web](http://aka.ms/spfx) and [gulp](https://github.com/gulpjs/gulp). These dependencies need to be updated together.


Updates `braces` from 3.0.2 to 3.0.3
- [Changelog](https://github.com/micromatch/braces/blob/master/CHANGELOG.md)
- [Commits](https://github.com/micromatch/braces/compare/3.0.2...3.0.3)

Updates `@microsoft/sp-build-web` from 1.18.0 to 1.20.1

Updates `gulp` from 4.0.2 to 5.0.0
- [Release notes](https://github.com/gulpjs/gulp/releases)
- [Changelog](https://github.com/gulpjs/gulp/blob/master/CHANGELOG.md)
- [Commits](https://github.com/gulpjs/gulp/compare/v4.0.2...v5.0.0)

---
updated-dependencies:
- dependency-name: braces
  dependency-type: indirect
- dependency-name: "@microsoft/sp-build-web"
  dependency-type: direct:development
- dependency-name: gulp
  dependency-type: direct:development
...

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

samples/react-quotes/package.json

@@ -26,13 +26,13 @@
   "devDependencies": {
     "@types/react": "16.8.8",
     "@types/react-dom": "^17.0.11",
-    "@microsoft/sp-build-web": "1.18.0",
+    "@microsoft/sp-build-web": "1.20.1",
     "@microsoft/sp-module-interfaces": "1.13.1",
     "@microsoft/sp-tslint-rules": "1.13.1",
     "@microsoft/rush-stack-compiler-3.9": "0.4.47",
     "@types/es6-promise": "0.0.33",
     "@types/webpack-env": "1.13.1",
     "ajv": "~6.12.3",
-    "gulp": "4.0.2"
+    "gulp": "5.0.0"
   }
 }