Fix: Use codecov/codecov-action to report coverage to codecov.io

[localheinz]

This pull request

• uses codecov/codecov-action to report coverage to codecov.io

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (master@999b38a). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #20   +/-   ##
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  Coverage          ?   99.82%           
  Complexity        ?      195           
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  Files             ?       40           
  Lines             ?      578           
  Branches          ?        0           
=========================================
  Hits              ?      577           
  Misses            ?        1           
  Partials          ?        0           

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[theseer]

@localheinz However that happend: The Pipeline after the merge is now broken again...?

[localheinz]

@theseer

I'll take a 👀!

[theseer]

While you're at it: I temporarily switched to using the action's tools keyword to install phpunit. While I don't understand how that can fail on macos but work on linux, I also dislike the fact that's a 2nd place where the phpunit version is managed. I would thus like to have it installed via phive again ;)

[localheinz]

@theseer

Looks like a temporary issue: https://github.com/phar-io/manifest/runs/5264996332?check_suite_focus=true#step:3:15.