Changes

jobs/gerrit-lint: use debian 13

Use debian 13, so we have a newer clang-format version (14 -> 19).

Change-Id: I747dce009bb2e91f16a15e79dbe274c162f64813

lint/lint_diff: print clang-format version

Change-Id: I076a518dccdb241a57628c385a60bffe30298a10

ansible: osmocom-obs-worker: remove lxc<5

I have applied a patch in our OBS server, which adjusts the version
check so we can build packages with newer LXC versions and sent it
upstream: https://github.com/openSUSE/obs-build/pull/1127

Remove the lxc version constraint (which finally allowed upgrading to a
newer opensuse version).

Related: OS#6975
Change-Id: I1e690bf91c4bebd1d46b51ec490daa339ea1107f