cubicweb-workorder #2888567 upgrade to cw3.16 to silence warnings [validation pending]

prioritynormal
typeenhancement
done in0.11.0
load0.100
load left0.000
closed by#8ea9c7e69751 [cw] upgrade to cw3.16 to silence warnings (closes #2888567)
patch[cw] upgrade to cw3.16 to silence warnings (closes #2888567) [applied]