Update Z3 to a new version.

60aad7a6623182eddc63d949cee4fde98922c65d + cherry-picked
091ef3dbec53d1ff7065bc9b0bf22a77c1efdccc

git-svn-id: https://svn.sosy-lab.org/software/cpachecker/trunk@14566 4712c6d2-40bb-43ae-aa4b-fec3f1bdfe4c