Fix CI: update php-cs-fixer

[vincentchalamon]

Q	A
Bug fix?	no
New feature?	no
BC breaks?	no
Deprecations?	no
Tests pass?	yes
Fixed tickets
License	MIT

[codecov]

Codecov Report

Merging #106 (1167a7a) into v5 (a5ab67c) will not change coverage.
The diff coverage is 40.00%.

@@            Coverage Diff            @@
##                 v5     #106   +/-   ##
=========================================
  Coverage     77.03%   77.03%           
  Complexity      220      220           
=========================================
  Files            36       36           
  Lines          1032     1032           
=========================================
  Hits            795      795           
  Misses          237      237           

Flag	Coverage Δ	Complexity Δ
phpunit	77.03% <40.00%> (ø)	0.00 <0.00> (ø)

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Impacted Files	Coverage Δ	Complexity Δ
src/Controller/Callback.php	64.28% <ø> (ø)	2.00 <0.00> (ø)
src/DependencyInjection/Configuration.php	98.96% <0.00%> (ø)	7.00 <0.00> (ø)
src/EnvelopeCreator/DefineEnvelope.php	97.61% <ø> (ø)	4.00 <0.00> (ø)
src/EnvelopeCreator/GetViewUrl.php	87.50% <ø> (ø)	4.00 <0.00> (ø)
src/Grant/JwtGrant.php	0.00% <0.00%> (ø)	7.00 <0.00> (ø)
src/DependencyInjection/DocusignExtension.php	98.67% <100.00%> (ø)	21.00 <0.00> (ø)
src/TokenEncoder/TokenEncoder.php	100.00% <100.00%> (ø)	4.00 <0.00> (ø)

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