PHP8.1 Update

[dolejska-daniel]

• refactor code to 8.1
• update dependencies

[TheMY3]

@dolejska-daniel maybe do you need help with it? Or all ready for release?

[dolejska-daniel]

Hi @TheMY3! Most definitely! I would certainly appreciate any help. I'm honestly not quite sure what kind of state this PR is in and whether there is more work to be done, but I don't think that I considered it finished at the time.

[TheMY3]

@dolejska-daniel check one more files - looks like it is done 🤔 maybe just run travis builds? I can not see it here.
Or I can test this PR locally and then write here. But I use only some endpoints.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@5e131ea). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master       #5   +/-   ##
=========================================
  Coverage          ?   68.20%           
  Complexity        ?      275           
=========================================
  Files             ?       12           
  Lines             ?      629           
  Branches          ?        0           
=========================================
  Hits              ?      429           
  Misses            ?      200           
  Partials          ?        0           

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