Added support for PHP 8 and composer 2

[IgorKorytin]

Description

Added

• Support PHP 8.x

Changed

• Composer 2.x is supported now
• Package fzaninotto/faker replaced with fakerphp/faker version ^1.12

Fixes # (issue)

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I wrote unit tests for my code (if tests is required for my changes)
• I have made changes in CHANGELOG.md file

[codecov-io]

Codecov Report

Merging #13 (cfa13f8) into master (5566a5c) will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff             @@
##              master       #13   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity       123       123           
===========================================
  Files             23        23           
  Lines            378       386    +8     
===========================================
+ Hits             378       386    +8     

Flag	Coverage Δ	Complexity Δ
php	100.00% <ø> (ø)	0.00 <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ	Complexity Δ
src/Receipts/Item.php	100.00% <0.00%> (ø)	9.00% <0.00%> (ø%)
src/Receipts/Receipt.php	100.00% <0.00%> (ø)	12.00% <0.00%> (ø%)
src/Requests/AbstractRequestBuilder.php	100.00% <0.00%> (ø)	7.00% <0.00%> (ø%)
src/Frameworks/Laravel/ServiceProvider.php	100.00% <0.00%> (ø)	4.00% <0.00%> (ø%)
...equests/Payments/Cards/CardsAuthRequestBuilder.php	100.00% <0.00%> (ø)	4.00% <0.00%> (ø%)
...equests/Payments/PaymentsConfirmRequestBuilder.php	100.00% <0.00%> (ø)	7.00% <0.00%> (ø%)
...uests/Payments/Tokens/TokensAuthRequestBuilder.php	100.00% <0.00%> (ø)	3.00% <0.00%> (ø%)

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[IgorKorytin]

CRR @tarampampam