Pin dependency phpunit/phpunit to 9.3.7

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
phpunit/phpunit (source)	require-dev	pin	^9.0 -> 9.3.7

📌 Important: Renovate will wait until you have merged this Pin PR before creating any upgrade PRs for the affected packages. Add the preset :preserveSemverRanges to your config if you instead don't wish to pin dependencies.

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[codecov]

Codecov Report

Merging #4 into master will increase coverage by 0.55%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master       #4      +/-   ##
============================================
+ Coverage     25.69%   26.25%   +0.55%     
+ Complexity      342      307      -35     
============================================
  Files            28       28              
  Lines          1179     1192      +13     
============================================
+ Hits            303      313      +10     
- Misses          876      879       +3     

Impacted Files	Coverage Δ	Complexity Δ
src/Docker/Distribution/Client.php	66.66% <0.00%> (-33.34%)	1.00% <0.00%> (ø%)
src/Docker/Swarm/Node/Client.php	0.00% <0.00%> (ø)	4.00% <0.00%> (ø%)
src/Docker/Swarm/Service/Client.php	0.00% <0.00%> (ø)	8.00% <0.00%> (ø%)
src/Docker/Image/ServiceProvider.php	100.00% <0.00%> (ø)	1.00% <0.00%> (ø%)
src/Docker/Plugin/ServiceProvider.php	100.00% <0.00%> (ø)	1.00% <0.00%> (ø%)
src/Docker/System/ServiceProvider.php	100.00% <0.00%> (ø)	1.00% <0.00%> (ø%)
src/Docker/Volume/ServiceProvider.php	100.00% <0.00%> (ø)	1.00% <0.00%> (ø%)
src/Docker/Network/ServiceProvider.php	100.00% <0.00%> (ø)	1.00% <0.00%> (ø%)
src/Docker/Container/ServiceProvider.php	100.00% <0.00%> (ø)	1.00% <0.00%> (ø%)
src/Docker/Swarm/Task/ServiceProvider.php	100.00% <0.00%> (ø)	1.00% <0.00%> (ø%)
... and 3 more

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