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* Switch from yarn to pnpm

* Set up changesets

* Update Rollup config

* Update all dependencies

* Remove obsolete dotfiles

* Replace yarn with pnpm in perf/

* Fix pnpm store path in GitHub Actions

* Add cjs-check plugin to Rollup

* Remove redundant option from .changeset/config.json

* Fix GitHub Actions workflow cache variable

* Use a ponyfill observable instead of polyfilling

To match behaviour of other packages like RxJS (https://github.com/ReactiveX/rxjs/blob/6fa819beb91ba99dadd6262d6c13f7ddfd9470c5/src/internal/symbol/observable.ts) and redux (https://github.com/reduxjs/redux/blob/cf5043a4de63cb3a26dfb5e7e2d5a68d2d8a79f5/src/utils/symbol-observable.ts).

* Update src/observable.ts to skip Symbol support check

https://github.com/0no-co/wonka/pull/121#discussion_r1000068633

Co-authored-by: Phil Pluckthun <phil@kitten.sh>

* Fix prettier issue

Co-authored-by: Paul Gerarts <paulgerarts@weave.nl>
Co-authored-by: Phil Pluckthun <phil@kitten.sh>