PROTON-2295 avoid broken Go 1.15.3 in macOS CI (#276)
PROTON-2295 avoid broken Go 1.15.3 in macOS CI (#276)

Go 1.15.3 is currently the default on macOS GH Action.
ChugR/qpid-proton,astitcher/qpid-proton,ssorj/qpid-proton,ssorj/qpid-proton,astitcher/qpid-proton,gemmellr/qpid-proton,astitcher/qpid-proton,apache/qpid-proton,astitcher/qpid-proton,ssorj/qpid-proton,ChugR/qpid-proton,apache/qpid-proton,ssorj/qpid-proton,astitcher/qpid-proton,apache/qpid-proton,apache/qpid-proton,apache/qpid-proton,astitcher/qpid-proton,ChugR/qpid-proton,ssorj/qpid-proton,ssorj/qpid-proton,ChugR/qpid-proton,ChugR/qpid-proton,gemmellr/qpid-proton,ChugR/qpid-proton,gemmellr/qpid-proton,gemmellr/qpid-proton,apache/qpid-proton,gemmellr/qpid-proton,gemmellr/qpid-proton