Update Emscripten binary wheels to include Emscripten platform tags. More work split off from #2591.

### Checklists

- [x] Add a [CHANGELOG](https://github.com/pyodide/pyodide/blob/main/docs/project/changelog.md) entry


package:
  name: pluggy
  version: 1.0.0
source:
  sha256: 74134bbf457f031a36d68416e1509f34bd5ccc019f0bcc952c7b909d06b37bd3
  url: https://files.pythonhosted.org/packages/9e/01/f38e2ff29715251cf25532b9082a1589ab7e4f571ced434f98d0139336dc/pluggy-1.0.0-py2.py3-none-any.whl
test:
  imports:
    - pluggy

package:
  name: pluggy
  version: 1.0.0
source:
  sha256: 74134bbf457f031a36d68416e1509f34bd5ccc019f0bcc952c7b909d06b37bd3
  url: https://files.pythonhosted.org/packages/9e/01/f38e2ff29715251cf25532b9082a1589ab7e4f571ced434f98d0139336dc/pluggy-1.0.0-py2.py3-none-any.whl
test:
  imports:
    - pluggy
