integrationtests: upgrade numpy before px4tools install (#8274)

During px4tools installation, the latest version of pandas is
installed, which requires numpy>=1.9.0. Pandas installs the required
version, however, due to the presence of the old numpy in the docker
image, the present version 1.8.2 is used, which leads to an error
when importing pandas.

This commit fixes the problem by explicitly upgrading numpy before
px4tools installation.

Signed-off-by: Andrey Korigodsky <akorigod@gmail.com>

integrationtests/run_tests.bash

@@ -6,6 +6,7 @@
 set -e
 
 # TODO move to docker image
+pip install --upgrade numpy -q
 pip install px4tools pymavlink -q
 
 # A POSIX variable