makefiles: bump riotdocker [backport 2025.01]

[maribu]

Backport of #21258

Contribution description

After RIOT-OS/riotdocker#257 as requested by CI in https://github.com/RIOT-OS/RIOT/actions/runs/13591031011

Testing procedure

static tests should succeed

[maribu]

This:

a) verifies that the release branch still builds with the new CI image, so that we can backport stuff
b) fixes the static-test that checks that the CI is using the same image as pinned in makefiles/docker.inc.mk

[riot-ci]

Murdock results

✔️ PASSED

fa51d0d makefiles: bump riotdocker

Success	Failures	Total	Runtime
148481	0	148484	01h:41m:01s

Artifacts

• Documentation preview

[mguetschow]

Would be nicer to pin riotdocker versions for each release, I'd say. But at least this fixes the issue for now.

[maribu]

The problem is that even backports run with the most recent version of riotbuild, no matter what. This PR just bumps the pinning of what to use for BUILD_IN_DOCKER=1 to match what is used in the CI. Otherwise users of the release branch may run into compilation issues that only happens with an older version of riotbuild.

I agree that it would be a lot better if we could pin the docker container the CI uses in a release branch. But until than, backporting the bump of the docker image is what brings CI and BUILD_IN_DOCKER=1 back in sync.