Migrate REUSE to toml format

[AndyScherzinger]

if REUSE GH action is green: all good to go 🚀

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 23.73%. Comparing base (d7288b0) to head (c4ee833).
Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #6314   +/-   ##
=========================================
  Coverage     23.73%   23.73%           
  Complexity      454      454           
=========================================
  Files           247      247           
  Lines         11731    11731           
  Branches       2223     2212   -11     
=========================================
  Hits           2784     2784           
  Misses         8627     8627           
  Partials        320      320           

Flag	Coverage Δ
javascript	15.33% <ø> (ø)
php	59.53% <ø> (ø)

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