Add Support for Laravel 10

[stefanzweifel]

This PR updates the Composer version constraints to support Laravel 10.
I've also updated the GitHub Actions workflow to test the package for Laravel 10 too.

[lieto-dk]

Hi, would be great to get this committed ! Highly appreciated!

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +1.07 🎉

Comparison is base (5d58bd0) 96.47% compared to head (0920332) 97.54%.

❗ Current head 0920332 differs from pull request most recent head eb31a69. Consider uploading reports for the commit eb31a69 to get more accurate results

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #107      +/-   ##
============================================
+ Coverage     96.47%   97.54%   +1.07%     
- Complexity       26       30       +4     
============================================
  Files             4        5       +1     
  Lines            85      122      +37     
============================================
+ Hits             82      119      +37     
  Misses            3        3              

see 4 files with indirect coverage changes

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