fix(datasource/pypi): use pypi.org/pypi registry instead of pypi.org/simple (#16293)

* fix(datasource/pypi): use pypi api instead of the simple variant

* fix(datasource/pypi): use pypi api instead of the simple variant

* fix(datasource/pypi): use pypi api instead of the simple variant

* fix(datasource/pypi): use pypi api instead of the simple variant

* Update lib/modules/datasource/pypi/index.ts

Co-authored-by: Michael Kriese <michael.kriese@visualon.de>