Declare required PHP runtime extensions

[mob-stuv]

✔️ Check all applicable options or remove those that do not apply

Q	A
Is bugfix?	✔️/❌
New feature?	✔️/❌
Breaks BC?	✔️/❌
Fixed issues	comma-separated list of tickets # fixed by the PR, if any

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.74%. Comparing base (0ed789c) to head (9dec9cd).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master      #16   +/-   ##
=========================================
  Coverage     73.74%   73.74%           
  Complexity      573      573           
=========================================
  Files            52       52           
  Lines          2030     2030           
=========================================
  Hits           1497     1497           
  Misses          533      533           

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