Support Symfony 6.0 + test with it and PHP 8.1

[vincentchalamon]

• Allow Symfony 6 in composer.json
• Test with Symfony 6
• Test with PHP 8.1
• Fix Symfony 6 compatibility
• Update to docusign/esign-client:^5.0 || ^6.0 (fix Update to docusign/esign-client:^6.0 #127)

Note: symfony/debug is not compatible with psr/log:^3.0

[codecov]

Codecov Report

Merging #126 (36a9e3c) into main (0bc143d) will decrease coverage by 0.32%.
The diff coverage is 91.66%.

@@             Coverage Diff              @@
##               main     #126      +/-   ##
============================================
- Coverage     71.70%   71.37%   -0.33%     
- Complexity      261      262       +1     
============================================
  Files            41       41              
  Lines          1138     1125      -13     
============================================
- Hits            816      803      -13     
  Misses          322      322              

Flag	Coverage Δ
phpunit	71.37% <91.66%> (-0.33%)	⬇️

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

Impacted Files	Coverage Δ
src/EnvelopeBuilder.php	28.09% <ø> (+0.23%)	⬆️
src/EnvelopeCreator/EnvelopeCreator.php	72.72% <ø> (-1.19%)	⬇️
...velopeCreator/TraceableEnvelopeBuilderCallable.php	0.00% <ø> (ø)
src/Twig/Extension/ClickwrapExtension.php	86.66% <0.00%> (ø)
src/DependencyInjection/DocusignExtension.php	98.70% <100.00%> (ø)
src/EnvelopeCreator/SendEnvelope.php	93.75% <100.00%> (-0.37%)	⬇️
src/Routing/DocusignLoader.php	80.00% <100.00%> (+1.05%)	⬆️
src/Translator/TranslatorAwareTrait.php	71.42% <100.00%> (ø)
src/DocusignBundle.php	0.00% <0.00%> (-75.00%)	⬇️
...ependencyInjection/Compiler/PluginCompilerPass.php	0.00% <0.00%> (-55.56%)	⬇️
... and 5 more

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[coveralls]

Pull Request Test Coverage Report for Build 1706854991

• 8 of 8 (100.0%) changed or added relevant lines in 3 files are covered.
• 16 unchanged lines in 7 files lost coverage.
• Overall coverage increased (+1.2%) to 75.791%

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Files with Coverage Reduction	New Missed Lines	%
src/EventSubscriber/AuthorizationCodeEventSubscriber.php	1	93.1%
src/DependencyInjection/Configuration.php	2	97.92%
src/EnvelopeCreator/TraceableEnvelopeBuilderCallable.php	2	0%
src/Filesystem/FilesystemDecorator.php	2	0%
src/Grant/JwtGrant.php	2	0%
src/DocusignBundle.php	3	0%
src/DependencyInjection/Compiler/PluginCompilerPass.php	4	0%

Totals
Change from base Build 1339090552:	1.2%
Covered Lines:	767
Relevant Lines:	1012

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💛 - Coveralls

[GregoireHebert]

Thanks Vincent :)
Minor change (I am being nitpicking here) before merging ^^