install-deps.sh: increase pip install timeout

install-deps.sh: increase pip install timeout

It is not uncommon for pip install to timeout with:

   Cannot fetch index base URL https://pypi.python.org/simple

because the default timeout is 15 seconds. When running from a CI, it
translates into bursts of false negatives when the network is saturated.

Increase the timeout to 10 minutes which is hopefully large enough to
only happen when there is a serious network problem.

Signed-off-by: Loic Dachary <ldachary@redhat.com>