fix: manually deploy icu4c dylibs for macOS

[shenlebantongying]

Stop using the trick of linking goldendict to icu4c-i18n/uc to bring the related dylibs to the app bundle.

(For whatever reason, icudata is not copied.

Edit -> icudata is in icuuc's pkg config file's Private.Lib as an indirect dependency. )

Instead, change the strategy into:

Find out the icu4c's dylibs then explicitly pass them to qt_deploy_runtime_dependencies (which pass the arguments to underlying macdeplogyqt -executable="path_to_some_dylib")

Actually fix https://github.com/xiaoyifang/goldendict-ng/issues/1954

[xiaoyifang]

(For whatever reason, icudata is not copied.)

I suspected that macdeployqt should be blamed.

[shenlebantongying]

This works -> https://github.com/shenlebantongying/goldendict-ng/actions/runs/11889509346/job/33126218459#step:9:60

[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[shenlebantongying]

I suspected that macdeployqt should be blamed.

I don't actually know what's wrong.

I also don't want to think too much of it, let's just live with this reality 😅

[shenlebantongying]

Why are you still changing it? @xiaoyifang

We don't need to link icu with goldendict and also don't need FindICU.

After this change, everything works fine with various problems considered.

Excluding logging message, there are 5 commands in total in this PR.

BTW, libzim needs to find icu through pkgconfig, and pkgconfig can find icu is because my previous temporal fix is not deleted. This PR also updates that temporal fixed to something reliable.

[xiaoyifang]

just to test some ideas. failed at last.:(

[shenlebantongying]

No worries. Build systems, every one of them and particularly C/C++, are 💩 :)