When the default dependency path is used for cache distributors, they
are looking for the dependency file in the project's root (including the
source code), which leads to tests taking a significant amount of time,
especially on Windows runners. We thus hit sporadic test failures.
Change the test cases such that dependency files are always searched for
inside of `__tests__/data`, ignoring the rest of the project.
* Rework python-pipenv-dependencies-caching test
* Update Pipfile.lock hash in the tests
* Rework python-pipenv-dependencies-caching-path test
* Set location for pipenv test
* Remove requests package from tests
* Test pipenv without caching
* Enable pipenv cache
