fix codecov-action version to 3.1.4 (last version supported by bionic)

[juggler31]

Description

Related Issue

Checklist

• I have followed the guidelines in our Contributing document
• My code respects the Definition of done available in the Development section of the documentation
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works.
• New and existing unit tests pass locally with my changes
• I added an entry in the changelog file
• My commits are all using prefix convention (emoji + tag name) and references associated issues
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[cypress]

Passing run #7874 ↗︎

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Details:

Merge 35d46d4 into f64f5e1...
Project: Geotrek-admin	Commit: 85e2fe4c32 ℹ️
Status: Passed	Duration: 02:03 💡
Started: Jan 29, 2024 12:36 PM	Ended: Jan 29, 2024 12:38 PM

Review all test suite changes for PR #3906 ↗︎

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (f64f5e1) 94.23% compared to head (35d46d4) 98.35%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3906      +/-   ##
==========================================
+ Coverage   94.23%   98.35%   +4.12%     
==========================================
  Files         293      293              
  Lines       22174    22174              
==========================================
+ Hits        20896    21810     +914     
+ Misses       1278      364     -914     

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