ci: bump codecov action to v4.5.0

[ClementTsang]

Description

A description of the change, what it does, and why it was made. If relevant (such as any change that modifies the UI), please provide screenshots of the changes:

Issue

If applicable, what issue does this address?

Closes: #

Testing

If relevant, please state how this was tested. All changes must be tested to work:

If this is a code change, please also indicate which platforms were tested:

• Windows
• macOS
• Linux

Checklist

If relevant, ensure the following have been met:

• Areas your change affects have been linted using rustfmt (cargo fmt)
• The change has been tested and doesn't appear to cause any unintended breakage
• Documentation has been added/updated if needed (README.md, help menu, doc pages, etc.)
• The pull request passes the provided CI pipeline
• There are no merge conflicts
• If relevant, new tests were added (don't worry too much about coverage)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 43.18%. Comparing base (b5b36f7) to head (edcc1f1).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1546      +/-   ##
==========================================
+ Coverage   42.14%   43.18%   +1.03%     
==========================================
  Files         103       99       -4     
  Lines       17377    16947     -430     
==========================================
- Hits         7324     7318       -6     
+ Misses      10053     9629     -424     

Flag	Coverage Δ
ubuntu-latest	43.18% <ø> (+0.01%)	⬆️
windows-2019	?

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