Update dependency react/async to ^4.1.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
react/async	require	minor	^4.0 -> ^4.1.0

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Release Notes

reactphp/async

v4.1.0

Compare Source

• Feature: Add new delay() function to delay program execution.
  (#​69 by @​clue)

  echo 'a';
  Loop::addTimer(1.0, function () {
      echo 'b';
  });
  React\Async\delay(3.0);
  echo 'c';
  
  // prints "a" at t=0.0s
  // prints "b" at t=1.0s
  // prints "c" at t=3.0s

• Update test suite, add PHPStan with max level and report failed assertions.
  (#​66 and #​76 by @​clue and #​61 and #​73 by @​WyriHaximus)

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🏰 Composer Production Dependency changes 🏰

Prod Packages	Operation	Base	Target	Link
react/async	Upgraded	v4.0.0	v4.1.0	Compare