ci: upgrade ubuntu 20.04/22.04 runners to 24.04 (#7843)

## Summary

- Upgrade `ubuntu-20.04`, `ubuntu-22.04` and `ubuntu-22.04-arm` GitHub
Actions runners to `ubuntu-24.04` / `ubuntu-24.04-arm` in `.github/`
- Where a matrix lists several of these (or already lists
`ubuntu-24.04`), collapse to a single entry instead of duplicating it
- `container:` images and comments are left alone

## Why

GitHub is retiring the Ubuntu 22.04 runner images: deprecation began
September 17, 2026
(expect longer queue times) and they are fully unsupported on **April
17, 2027**, with
scheduled brownouts that deliberately fail `ubuntu-22.04` jobs in March
and April 2027.
See
[actions/runner-images#14254](actions/runner-images#14254).
`ubuntu-20.04` was already retired in April 2025, so jobs still on it
cannot run.

## Review notes

`ubuntu-24.04` ships different system software than 22.04 (glibc 2.39,
newer compilers
and default Python, different packages). Check any job that depends on
an older compiler
or package, an old Python version, or that builds binaries meant to run
on older
distributions: those may need to stay on 22.04 until they are migrated
deliberately.

---

Generated by [repomod](https://github.com/getsentry/repomod).

Author: joshuarli

.github/workflows/release-comment-issues.yml

@@ -17,7 +17,7 @@ permissions:
 
 jobs:
   release-comment-issues:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
     name: Notify issues
     steps:
       - name: Get version