qt 6.3.0

[ericLemanissier]

Specify library name and version: qt/6.3.0

closes #10050
fixes #10174

This is also a good place to share with all of us why you are submitting this PR (specially if it is a new addition to ConanCenter): is it a dependency of other libraries you want to package? Are you the author of the library? Thanks!

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• I've read the guidelines for contributing.
• I've followed the PEP8 style guides for Python code in the recipes.
• I've used the latest Conan client version.
• I've tried at least one configuration locally with the conan-center hook activated.

[ghost]

I detected other pull requests that are modifying qt/6.x.x recipe:

• qt/6: Bump openssl version #10050
• [qt6] use msvc-clang by default #10027

This message is automatically generated by https://github.com/ericLemanissier/conan-center-conflicting-prs so don't hesitate to report issues/improvements there.

[ericLemanissier]

so, it errors with qtbase/src/corelib/text/qlocale_tools.cpp:57:10: fatal error: 'charconv' file not found on linux clang with libstdc++.
According to https://gcc.gnu.org/onlinedocs/libstdc++/manual/status.html#status.iso.2017, charconv was implemented in libstdc++ 8.1
I think there is no way to put a restriction on libstdc++'s version right ?

[conan-center-bot]

All green in build 23 (80c63bac926d5b1c7c3eeb14a5b5917a340a34db):

• qt/6.0.4@:
  All packages built successfully! (All logs)

• qt/6.1.3@:
  All packages built successfully! (All logs)

• qt/6.3.0@:
  All packages built successfully! (All logs)

• qt/6.2.4@:
  All packages built successfully! (All logs)

[ericLemanissier]

@madebr @SpaceIm @jgsogo @intelligide @toge May I ask you for a final review ? The CI status is pending, but all builds have been reported as successful 3 days ago.