CAMEL-11930: increase Maven memory to 3GB
CAMEL-11930: increase Maven memory to 3GB

Seems that with 2GB we're running out of heap on CI[1] so let's increase
it to 3.5GB.

[1] https://builds.apache.org/view/C/view/Apache%20Camel/job/Camel/job/master/98/execution/node/62/log/

jamesnetherton/camel,Fabryprog/camel,akhettar/camel,gnodet/camel,nikhilvibhav/camel,onders86/camel,curso007/camel,adessaigne/camel,mcollovati/camel,apache/camel,objectiser/camel,gautric/camel,curso007/camel,akhettar/camel,ullgren/camel,jonmcewen/camel,apache/camel,CodeSmell/camel,christophd/camel,onders86/camel,DariusX/camel,kevinearls/camel,cunningt/camel,snurmine/camel,zregvart/camel,jonmcewen/camel,apache/camel,apache/camel,davidkarlsen/camel,tadayosi/camel,pax95/camel,adessaigne/camel,kevinearls/camel,snurmine/camel,dmvolod/camel,DariusX/camel,cunningt/camel,gautric/camel,nikhilvibhav/camel,jonmcewen/camel,curso007/camel,cunningt/camel,gautric/camel,dmvolod/camel,sverkera/camel,objectiser/camel,anoordover/camel,jonmcewen/camel,cunningt/camel,cunningt/camel,tadayosi/camel,curso007/camel,adessaigne/camel,curso007/camel,onders86/camel,snurmine/camel,gautric/camel,kevinearls/camel,tdiesler/camel,jamesnetherton/camel,CodeSmell/camel,objectiser/camel,dmvolod/camel,curso007/camel,punkhorn/camel-upstream,tadayosi/camel,Fabryprog/camel,davidkarlsen/camel,kevinearls/camel,pmoerenhout/camel,jamesnetherton/camel,tdiesler/camel,alvinkwekel/camel,ullgren/camel,snurmine/camel,nikhilvibhav/camel,adessaigne/camel,akhettar/camel,punkhorn/camel-upstream,zregvart/camel,Fabryprog/camel,tadayosi/camel,tadayosi/camel,christophd/camel,pmoerenhout/camel,tdiesler/camel,zregvart/camel,jonmcewen/camel,mcollovati/camel,pax95/camel,DariusX/camel,apache/camel,objectiser/camel,tdiesler/camel,apache/camel,gnodet/camel,zregvart/camel,ullgren/camel,pax95/camel,gnodet/camel,akhettar/camel,pmoerenhout/camel,tadayosi/camel,dmvolod/camel,gautric/camel,sverkera/camel,anoordover/camel,sverkera/camel,tdiesler/camel,pmoerenhout/camel,jonmcewen/camel,cunningt/camel,anoordover/camel,pax95/camel,jamesnetherton/camel,christophd/camel,anoordover/camel,anoordover/camel,pmoerenhout/camel,dmvolod/camel,nicolaferraro/camel,sverkera/camel,nikhilvibhav/camel,CodeSmell/camel,christophd/camel,gnodet/camel,sverkera/camel,pax95/camel,CodeSmell/camel,gnodet/camel,anoordover/camel,nicolaferraro/camel,ullgren/camel,davidkarlsen/camel,Fabryprog/camel,sverkera/camel,onders86/camel,alvinkwekel/camel,snurmine/camel,snurmine/camel,davidkarlsen/camel,akhettar/camel,onders86/camel,nicolaferraro/camel,adessaigne/camel,pmoerenhout/camel,kevinearls/camel,mcollovati/camel,jamesnetherton/camel,dmvolod/camel,christophd/camel,tdiesler/camel,jamesnetherton/camel,pax95/camel,akhettar/camel,mcollovati/camel,alvinkwekel/camel,alvinkwekel/camel,adessaigne/camel,punkhorn/camel-upstream,nicolaferraro/camel,gautric/camel,christophd/camel,kevinearls/camel,punkhorn/camel-upstream,DariusX/camel,onders86/camel