Set DTCoreText version to 1.6.26

[aringenbach]

Set DTCoreText version down to 1.6.26 because:

• For some reason version 1.6.27 is not officially "released" on GitHub
• Integration tests have shown that attributed strings created with 1.6.27, tend to have more runs than those created with 1.6.26 (supposedly less runs means more performance)
• And also this doesn't seem to break anything else than not having access to DTDefaultFontDescriptor anymore

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (3a4686f) 90.17% compared to head (0522201) 90.17%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #743   +/-   ##
=======================================
  Coverage   90.17%   90.17%           
=======================================
  Files         113      113           
  Lines       16120    16122    +2     
  Branches      565      565           
=======================================
+ Hits        14536    14538    +2     
  Misses       1563     1563           
  Partials       21       21           

Flag	Coverage Δ
uitests	82.34% <100.00%> (+0.02%)	⬆️
uitests-ios	82.34% <100.00%> (+0.02%)	⬆️
unittests	89.09% <100.00%> (+0.02%)	⬆️
unittests-ios	80.47% <100.00%> (+0.30%)	⬆️
unittests-rust	89.94% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...ysiwygComposer/Sources/HTMLParser/HTMLParser.swift	92.94% <100.00%> (+0.17%)	⬆️

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