chore(deps): bump tar and @microsoft/sp-build-web

Removes [tar](https://github.com/isaacs/node-tar). It's no longer used after updating ancestor dependency [@microsoft/sp-build-web](http://aka.ms/spfx). These dependencies need to be updated together.


Removes `tar`

Updates `@microsoft/sp-build-web` from 1.20.2 to 1.23.2

---
updated-dependencies:
- dependency-name: tar
  dependency-version:
  dependency-type: indirect
- dependency-name: "@microsoft/sp-build-web"
  dependency-version: 1.23.2
  dependency-type: direct:development
...

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

Author: dependabot[bot]