deps: upgrade to rpt2 0.32.1 to fix configPlugin declarationMap issue

- Per b14060c, I ran into a bug in rpt2 when using it as a `configPlugin` and enabling declarationMaps
  - that bug was actually due to some code _I_ wrote in rpt2 and an edge case I didn't know existed (`configPlugin` usage means Rollup has no `output`)
  - so I eventually fixed it myself too
  - and in the past month I stepped up to help maintain rpt2 and fixed a ton of issues and improved lots of things per the release notes :)

- since declarationMaps now work while using as a `configPlugin`, remove the workaround `tsconfig.rollup.json`

Author: agilgur5