chore(deps): update actions/cache action to v2

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
actions/cache	action	major	v1 -> v2

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Release Notes

actions/cache

### [`v2`](https://togithub.com/actions/cache/compare/v1...v2) [Compare Source](https://togithub.com/actions/cache/compare/v1...v2)

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[codecov[bot]]

Codecov Report

Merging #72 into master will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##            master       #72   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines           19        19           
  Branches         4         4           
=========================================
  Hits            19        19           

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