[OPENENGSB-1744] Upgrade maven connector reference to openengsb-connector-maven-1.2.3
[OPENENGSB-1744] Upgrade maven connector reference to openengsb-connector-maven-1.2.3

Signed-off-by: Andreas Pieber <57efbcbb22ec0bd89955a40df26b44c340d3e38d@gmail.com>
(cherry picked from commit 8e1251a69dbd76c5f95723f890c84af048462536)

Signed-off-by: Andreas Pieber <57efbcbb22ec0bd89955a40df26b44c340d3e38d@gmail.com>

openengsb/openengsb,openengsb/openengsb,openengsb/openengsb,openengsb/openengsb,openengsb/openengsb,openengsb/openengsb