Use new stable version of install-qt-action.

[boppybibbles]

No description provided.

[coveralls]

Coverage decreased (-0.004%) to 7.081% when pulling 9e89a0e on boppybibbles:patch-1 into b0cdc00 on IJHack:master.

[codecov]

Codecov Report

Merging #502 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master    #502   +/-   ##
======================================
  Coverage    9.36%   9.36%           
======================================
  Files          46      46           
  Lines        2925    2925           
======================================
  Hits          274     274           
  Misses       2651    2651

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