Indicate new Maven version requirement 3.3.3 for Camel 2.20 build
Indicate new Maven version requirement 3.3.3 for Camel 2.20 build

see http://camel.apache.org/camel-2200-release.html#Camel2.20.0Release-Importantchangestoconsiderwhenupgrading

Signed-off-by: Aurélien Pupier <9fa310c88c8608d6204139bd981d00990bd6c0cd@redhat.com>
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