[TASK] Allow PHPStan to use unlimited processes (#1550)

This helps speed up local development and CI.

Author: oliverklee

config/phpstan.neon

@@ -2,10 +2,6 @@ includes:
     - phpstan-baseline.neon
 
 parameters:
-  parallel:
-    # Don't be overly greedy on machines with more CPU's to be a good neighbor especially on CI
-    maximumNumberOfProcesses: 5
-
   phpVersion: 70200
 
   level: 6