[PATCH 2/2] ci: bump ubuntu image version for static-analysis job

We recently ran into a case[1] where old versions of coccinelle ran very slowly, but newer ones are fine. The version we use in GitHub's CI was the old slow version, leading to timeouts of the static-analysis job.

We get the old version because we ask for the ubuntu-22.04 image. That has coccinelle 1.1.1, but the "fast" improvement is in coccinelle 1.3.0, specifically their 58619b8fe (break up envs for e1 & e2, 2024-08-18).

Bumping to ubuntu-25.10 would be enough to get that new version. But I don't see any need to ask for a specific version at all. We originally used a specific version because coccinelle wasn't available in ubuntu 20.04, so we pinned to 18.04 in d051ed77ee (.github/workflows/main.yml: run static-analysis on bionic, 2021-02-08). Later that got bumped in ef46584831 (ci: update 'static-analysis' to Ubuntu 22.04, 2022-08-23) when 18.04 support was dropped.

It seems like the absence of coccinelle was a blip in 20.04, and we can just stick with "latest" going forward.

I tested the result on GitHub's CI. I bumped the matching line in the GitLab definition, but didn't have a simple means of testing (but it's such a trivial change nothing could go wrong, right?).

[1] https://lore.kernel.org/git/20260724091152.27794-2-tnyman@openai.com/

Signed-off-by: Jeff King <peff@peff.net>
---
 .github/workflows/main.yml | 4 ++--
 .gitlab-ci.yml             | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)