build: update Fedora 42 to 43 in Packit build targets list

[infinitewarp]

Summary by Sourcery

Build:

• Adjust Packit build targets to replace Fedora 42 (x86_64 and aarch64) with Fedora 43 equivalents.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Updates Packit build configuration to replace Fedora 42 build targets with Fedora 43 for x86_64 and aarch64 in the main build job.

File-Level Changes

Change	Details	Files
Bump Packit Fedora build targets from 42 to 43.	Update Fedora x86_64 future-preview build target from 42 to 43 Update Fedora aarch64 future-preview build target from 42 to 43	.packit.yaml

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.47%. Comparing base (d998019) to head (a4db72b).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #420   +/-   ##
=======================================
  Coverage   96.47%   96.47%           
=======================================
  Files         138      138           
  Lines        8690     8690           
=======================================
  Hits         8384     8384           
  Misses        306      306           

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