ci: remove python requests
This comes from the master branch but we do not need it on the ir1 branch;
remove it from the CI.
Signed-off-by: 
Vincent Stehlé <vincent.stehle@arm.com>
This comes from the master branch but we do not need it on the ir1 branch;
remove it from the CI.
Signed-off-by: Vincent Stehlé <vincent.stehle@arm.com>