Ouranosinc / xclim / 10909344621

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Use caching to speed up testdata fetching, fix upstream builds, scipy suggestions (#1906)

### What kind of change does this PR introduce?

* Employs caching of `pip` dependencies, the `tox` environments and the
`xclim-testdata` cache to speed up the CI setup on subsequent builds.
* Deals with an issue that was affecting the upstream build
dependencies, causing their installation to silently fail.

### Does this PR introduce a breaking change?

No.

### Other information:

https://github.com/actions/cache

Preliminary results suggest that this will shave at least 30 seconds off
of the setup times for most builds (except for `prefetch`-based `tox`
environments, as this build is designed to test the fetching of the test
data).

Also worth noting: Caches are immutable once created!

9 of 17 new or added lines in 5 files covered. (52.94%)

9145 of 10230 relevant lines covered (89.39%)

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