Removed default values for mandatory parameters (PHP 8 fix)

[aik099]

Closes #213.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 63.17%. Comparing base (7c811b7) to head (63f0ae1).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
src/Jira/Api/Client/MemcacheProxyClient.php	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #226   +/-   ##
=========================================
  Coverage     63.17%   63.17%           
  Complexity      208      208           
=========================================
  Files            10       10           
  Lines           687      687           
=========================================
  Hits            434      434           
  Misses          253      253           

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