fix: delete accidentally commited binary file

In db0b391 I accidentally commited the
downloaded bzImage used in our benchmarks/tests into the repository.
Remove this binary again, as it has no business being here

Fixes: db0b391 ("fix: Update linux image used in tests")
Reported-by: Ruoqing He <heruoqing@iscas.ac.cn>
Signed-off-by: Patrick Roy <roypat@amazon.co.uk>

Author: roypat