pip-requirements.txt: Update extensions min version to 0.13.3

pip-requirements.txt: Update extensions min version to 0.13.3

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=2616
Pytool extensions are locked on 0.12.x but extensions has
moved to 0.13.x. So update the pip-requirements.txt.

Cc: Sean Brogan <sean.brogan@microsoft.com>
Cc: Bret Barkelew <Bret.Barkelew@microsoft.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Signed-off-by: Shenglei Zhang <shenglei.zhang@intel.com>
Reviewed-by: Bret Barkelew <bret.barkelew@microsoft.com>