hugetop: replace chrono usage with jiff

[alxndrv]

Closes #761

[codecov]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 19.20%. Comparing base (ff57f04) to head (0987043).
⚠️ Report is 8 commits behind head on main.

Files with missing lines	Patch %	Lines
src/uu/hugetop/src/hugetop.rs	0.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #774   +/-   ##
=======================================
  Coverage   19.20%   19.20%           
=======================================
  Files          68       68           
  Lines       10156    10156           
  Branches      546      546           
=======================================
  Hits         1950     1950           
  Misses       8206     8206           

Flag	Coverage Δ
macos_latest	6.75% <0.00%> (ø)
ubuntu_latest	19.55% <0.00%> (ø)
windows_latest	0.02% <0.00%> (ø)

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