Bump jszip and @microsoft/sp-build-web in /samples/react-advent-calendar

Bumps [jszip](https://github.com/Stuk/jszip) to 3.8.0 and updates ancestor dependency [@microsoft/sp-build-web](http://aka.ms/spfx). These dependencies need to be updated together.


Updates `jszip` from 3.5.0 to 3.8.0
- [Changelog](https://github.com/Stuk/jszip/blob/main/CHANGES.md)
- [Commits](https://github.com/Stuk/jszip/compare/v3.5.0...v3.8.0)

Updates `@microsoft/sp-build-web` from 1.17.3 to 1.18.2

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

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

samples/react-advent-calendar/package.json

@@ -29,7 +29,7 @@
     "@rushstack/eslint-config": "2.5.1",
     "@microsoft/eslint-plugin-spfx": "1.17.3",
     "@microsoft/eslint-config-spfx": "1.17.3",
-    "@microsoft/sp-build-web": "1.17.3",
+    "@microsoft/sp-build-web": "1.18.2",
     "@types/webpack-env": "~1.15.2",
     "ajv": "^6.12.5",
     "eslint": "8.7.0",