ci/diffs: remove cgroup_xattr test fix

Link: https://lore.kernel.org/bpf/CAADnVQLcYZWjBVqAXR4QgpzubZ1R_5sWi0TmGs8dFDu+FNc3xg@mail.gmail.com/
Signed-off-by: Ihor Solodrai <[email protected]>

Author: theihor