chore: Update Arch Linux package URL in README.md

[felixonmars]

The old URL returns 404 now.

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Release note for CHANGELOG:

NONE

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (acf412e) 75.67% compared to head (2798c0d) 75.67%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3500   +/-   ##
=======================================
  Coverage   75.67%   75.67%           
=======================================
  Files         175      175           
  Lines       39106    39106           
=======================================
  Hits        29592    29592           
  Misses       8437     8437           
  Partials     1077     1077           

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