update libheif to 1.19.5 version

[bigcat88]

Should fix CI.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.89%. Comparing base (03c7beb) to head (2c96d19).
Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##            master     #312      +/-   ##
===========================================
- Coverage   100.00%   99.89%   -0.11%     
===========================================
  Files           10       10              
  Lines          976      976              
===========================================
- Hits           976      975       -1     
- Misses           0        1       +1     

see 1 file with indirect coverage changes

[bigcat88]

For now I've just temporarily commented out CI for quick tests on Linux, because it's unclear how long it will take to update the package on ppa:libheif, and people are asking for a new version.