docs(maintainers): update Arm Total Compute maintainers

Add Artem Kopotev and Oleksandr Tarhunakov

Change-Id: Ic4ca4790f1a4f82ffdb91841b9d9112f9ce9e856
Signed-off-by: Artem Kopotev <artem.kopotev@arm.com>
1 file changed