Update bbappends for scarthgap 5.0.1

Make python3-grpcio and python3-pyqt5 bbappends wildcards to handle
version bump in scarthgap 5.0.1 and any future updates.  Also fix
python3-pyqt5 bbappend for Yocto layer compatibility requirements.

Bug-AGL: SPEC-5149

Change-Id: Ie3b88f875c7186d54c470173ebb23472ed0bb4ed
Signed-off-by: Scott Murray <scott.murray@konsulko.com>
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/meta-agl-demo/+/29952
Reviewed-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>
Tested-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>