chore(github): update forum URL

[ChristophWurst]

Resolve #1601

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 39.62%. Comparing base (c38e503) to head (bf5cf52).
Report is 8 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #1602   +/-   ##
=========================================
  Coverage     39.62%   39.62%           
  Complexity      107      107           
=========================================
  Files            20       20           
  Lines           323      323           
=========================================
  Hits            128      128           
  Misses          195      195           

Flag	Coverage Δ
unittests	39.62% <ø> (ø)

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