.mypy.ini: relax checks on optional modules
The jsonschema and packaging python modules are optional; relax checking
accordingly.
Signed-off-by: 
Vincent Stehlé <vincent.stehle@arm.com>
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The jsonschema and packaging python modules are optional; relax checking
accordingly.
Signed-off-by: Vincent Stehlé <vincent.stehle@arm.com>