build(linux)!: drop ubuntu 20.04

[ReenigneArcher]

Description

Drop support for Ubuntu 20.04.

While, I understand Ubuntu will support this release for another year with security updates I think it time we drop support for providing new package for it on our side.

There are a few reasons to consider dropping support.

• Boost version is too old, which has hindered many PRs in the past and will likely hinder many more going forward. One current example is Use C++20. #2322. Previous PRs that I can remember wanted to use Boost JSON, but couldn't because it wasn't added until Boost 1.75.0.
• Ubuntu 24.04 will be shipping soon, supporting 3 Ubuntu distros will strain the CI. I believe support 2 of each Ubuntu/Debian/Fedora is sufficient.

Screenshot

Issues Fixed or Closed

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Dependency update (updates to dependencies)
• Documentation update (changes to documentation)
• Repository update (changes to repository files, e.g. .github/...)

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated the in code docstring/documentation-blocks for new or existing methods/components

Branch Updates

LizardByte requires that branches be up-to-date before merging. This means that after any PR is merged, this branch
must be updated before it can be merged. You must also
Allow edits from maintainers.

• I want maintainers to keep my branch updated

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 6.82%. Comparing base (e158878) to head (e40a266).

Additional details and impacted files

@@            Coverage Diff             @@
##           nightly   #2327      +/-   ##
==========================================
- Coverage     7.83%   6.82%   -1.02%     
==========================================
  Files           65      68       +3     
  Lines        13680   14424     +744     
  Branches      6197    6353     +156     
==========================================
- Hits          1072     984      -88     
- Misses       11681   12668     +987     
+ Partials       927     772     -155     

Flag	Coverage Δ
Linux	?
Windows	2.00% <ø> (?)
macOS-12	8.73% <ø> (-0.14%)	⬇️
macOS-13	8.07% <ø> (?)
macOS-14	8.39% <ø> (ø)

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see 69 files with indirect coverage changes