Enhancement: Update phpstan/phpstan and friends

[localheinz]

This PR

• updates phpstan/phpstan and friends

💁‍♂️ For reference, see

• Jan0707/phpstan-prophecy@0.2.0...0.3.0
• phpstan/phpstan@0.10.7...0.11
• phpstan/phpstan-deprecation-rules@0.10.2...0.11
• phpstan/phpstan-strict-rules@0.10.1...0.11

[codecov]

Codecov Report

Merging #159 into 1.x will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##                1.x     #159   +/-   ##
=========================================
  Coverage     82.77%   82.77%           
  Complexity       36       36           
=========================================
  Files             2        2           
  Lines           180      180           
=========================================
  Hits            149      149           
  Misses           31       31

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