drop support of Ubuntu 20.04

[shogo82148]

ref. actions/runner-images#11101

Summary by CodeRabbit

• Chores

  • Updated build, testing, and toolchain environments to run on newer Linux releases (Ubuntu 22.04/24.04) for improved consistency.
  • Streamlined testing by removing older, unsupported Linux versions.

• Documentation

  • Revised the supported operating systems table to reflect current Linux version standards for clarity.

[coderabbitai]

Walkthrough

This pull request updates the GitHub Actions workflows and documentation to use Ubuntu 22.04 instead of Ubuntu 20.04. The modifications affect the runs-on attribute in build jobs across multiple workflow files, remove the Ubuntu 20.04 entry from the test matrix, and update the supported OS table in the README for Linux. There are no changes to the job steps or dependencies.

Changes

File(s)	Change Summary
.github/workflows/linux-x64.yml, .github/workflows/update-build-tools.yml	Updated runs-on from ubuntu-20.04 to ubuntu-22.04 in build-related jobs.
.github/workflows/test.yml	Removed ubuntu-20.04 from the test matrix; now testing only on ubuntu-24.04, ubuntu-22.04, and their ARM variants.
README.md	Revised the supported OS table to list only ubuntu-22.04 and ubuntu-24.04 for Linux.

Sequence Diagram(s)

Poem

Hopping through lines of code with a joyful tune,
Ubuntu 22.04 now lights up the room.
The old 20.04 fades like a wisp in the breeze,
As new builds run with effortless ease.
I'm a coding rabbit, with whiskers so spry –
Celebrating updates as I hop by! 🐰

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📜 Recent review details

Configuration used: CodeRabbit UI
Review profile: CHILL
Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between ba24d43 and a021050.

📒 Files selected for processing (4)

• .github/workflows/linux-x64.yml (2 hunks)
• .github/workflows/test.yml (0 hunks)
• .github/workflows/update-build-tools.yml (1 hunks)
• README.md (1 hunks)

💤 Files with no reviewable changes (1)

• .github/workflows/test.yml

🔇 Additional comments (4)

.github/workflows/update-build-tools.yml (1)

16-16: Update OS Version for Linux Job.
The job now correctly uses ubuntu-22.04 instead of the deprecated ubuntu-20.04, aligning with the PR objective of dropping Ubuntu 20.04 support.

README.md (1)

85-90: Update Supported OS Table.
The Linux supported versions have been updated to include only ubuntu-22.04 and ubuntu-24.04, which is consistent with the removal of Ubuntu 20.04 from the project. This update keeps the documentation in sync with the workflow changes.

.github/workflows/linux-x64.yml (2)

68-68: Update Build Job OS Version.
The build job now runs on ubuntu-22.04, which correctly reflects the discontinuation of Ubuntu 20.04 support and is consistent with the changes in other workflow files.

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127-127: Update Build-Multi-Thread Job OS Version.
The multi-thread build job’s runs-on attribute has been updated to ubuntu-22.04, ensuring consistency across all jobs by removing the outdated Ubuntu version.

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[Copilot]

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.