deskutils/fet: Update to 5.48.0

Changelog:
  - Updated the code to be compliant with the future Qt 6.0.0.
  - Corrected a few warnings appearing with the new Qt 5.15.2
    (about using deprecated Qt functions).
  - Corrected three minor warnings when compiling with clang.
  - Theoretical improvement/logic bug fixed in the generation when using
    constraints of type students (set) early max beginnings at second hour
    without max gaps constraints or with more than zero max gaps allowed.
  - Added a warning if using constraints of type teacher(s)/students (set)
    max hours daily with weights less than 100%, because the algorithm is not
    perfectly implemented in this case.
  - Minor code improvements and cleanup.

PR:		251476
Submitted by:	Zsolt Udvari (maintainer)

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