Tests fixes(PHP 8.1, guzzlehttp/psr7)

[erikn69]

Support PHP 8.1
Fix guzzlehttp/psr7

[codecov-commenter]

Codecov Report

Merging #908 (badf162) into master (ea8e5ad) will not change coverage.
The diff coverage is 33.33%.

@@            Coverage Diff            @@
##             master     #908   +/-   ##
=========================================
  Coverage     91.05%   91.05%           
  Complexity        2        2           
=========================================
  Files            60       60           
  Lines          1722     1722           
=========================================
  Hits           1568     1568           
  Misses          154      154           

Impacted Files	Coverage Δ
src/API/Controller.php	72.72% <0.00%> (ø)
src/ChannelManagers/RedisChannelManager.php	97.30% <ø> (ø)
src/Channels/Channel.php	95.45% <ø> (ø)
src/Channels/PresenceChannel.php	100.00% <ø> (ø)
src/Channels/PrivateChannel.php	100.00% <ø> (ø)
src/Dashboard/Http/Controllers/SendMessage.php	34.78% <0.00%> (ø)
src/Server/Exceptions/ConnectionsOverCapacity.php	100.00% <ø> (ø)
src/Server/Exceptions/InvalidSignature.php	100.00% <ø> (ø)
...c/Server/Messages/PusherChannelProtocolMessage.php	100.00% <ø> (ø)
src/Statistics/Statistic.php	100.00% <ø> (ø)
... and 1 more

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[mpociot]

thank you