[deps]: Update actions/upload-artifact action to v6

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/upload-artifact	action	major	v5.0.0 -> v6.0.0

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Release Notes

actions/upload-artifact (actions/upload-artifact)

v6.0.0

Compare Source

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Configuration

📅 Schedule: Branch creation - "every 2nd week starting on the 2 week of the year before 4am on Monday" (UTC), Automerge - At any time (no schedule defined).

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♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

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[bitwarden-bot]

Internal tracking:

• ID: PM-30032
• Link: https://bitwarden.atlassian.net/browse/PM-30032

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 58.55%. Comparing base (69d72c2) to head (b17e6f6).
⚠️ Report is 13 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6766   +/-   ##
=======================================
  Coverage   58.55%   58.55%           
=======================================
  Files        1925     1925           
  Lines       85669    85669           
  Branches     7669     7669           
=======================================
  Hits        50162    50162           
  Misses      33649    33649           
  Partials     1858     1858           

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