test_events: Fix a missing mypy import.
test_events: Fix a missing mypy import.

mahim97/zulip,shubhamdhama/zulip,Galexrt/zulip,hackerkid/zulip,amanharitsh123/zulip,tommyip/zulip,shubhamdhama/zulip,synicalsyntax/zulip,punchagan/zulip,showell/zulip,vaidap/zulip,showell/zulip,brainwane/zulip,mahim97/zulip,Galexrt/zulip,mahim97/zulip,Galexrt/zulip,punchagan/zulip,rht/zulip,hackerkid/zulip,kou/zulip,rishig/zulip,Galexrt/zulip,eeshangarg/zulip,shubhamdhama/zulip,hackerkid/zulip,hackerkid/zulip,tommyip/zulip,amanharitsh123/zulip,andersk/zulip,synicalsyntax/zulip,zulip/zulip,brockwhittaker/zulip,verma-varsha/zulip,synicalsyntax/zulip,shubhamdhama/zulip,rishig/zulip,shubhamdhama/zulip,dhcrzf/zulip,dhcrzf/zulip,kou/zulip,shubhamdhama/zulip,andersk/zulip,timabbott/zulip,Galexrt/zulip,kou/zulip,vaidap/zulip,brockwhittaker/zulip,andersk/zulip,andersk/zulip,zulip/zulip,brainwane/zulip,jackrzhang/zulip,rht/zulip,kou/zulip,andersk/zulip,jackrzhang/zulip,zulip/zulip,brainwane/zulip,zulip/zulip,zulip/zulip,dhcrzf/zulip,showell/zulip,vaidap/zulip,verma-varsha/zulip,punchagan/zulip,rht/zulip,verma-varsha/zulip,mahim97/zulip,rishig/zulip,amanharitsh123/zulip,rishig/zulip,hackerkid/zulip,shubhamdhama/zulip,synicalsyntax/zulip,amanharitsh123/zulip,brockwhittaker/zulip,showell/zulip,eeshangarg/zulip,dhcrzf/zulip,eeshangarg/zulip,brockwhittaker/zulip,punchagan/zulip,mahim97/zulip,tommyip/zulip,tommyip/zulip,punchagan/zulip,hackerkid/zulip,eeshangarg/zulip,rishig/zulip,synicalsyntax/zulip,timabbott/zulip,jackrzhang/zulip,verma-varsha/zulip,andersk/zulip,rht/zulip,punchagan/zulip,timabbott/zulip,timabbott/zulip,verma-varsha/zulip,kou/zulip,rishig/zulip,timabbott/zulip,rishig/zulip,brainwane/zulip,amanharitsh123/zulip,hackerkid/zulip,eeshangarg/zulip,dhcrzf/zulip,rht/zulip,zulip/zulip,verma-varsha/zulip,brockwhittaker/zulip,mahim97/zulip,vaidap/zulip,jackrzhang/zulip,kou/zulip,rht/zulip,punchagan/zulip,timabbott/zulip,zulip/zulip,tommyip/zulip,brainwane/zulip,tommyip/zulip,kou/zulip,amanharitsh123/zulip,synicalsyntax/zulip,synicalsyntax/zulip,Galexrt/zulip,rht/zulip,timabbott/zulip,showell/zulip,eeshangarg/zulip,jackrzhang/zulip,jackrzhang/zulip,tommyip/zulip,andersk/zulip,jackrzhang/zulip,showell/zulip,eeshangarg/zulip,vaidap/zulip,dhcrzf/zulip,vaidap/zulip,brainwane/zulip,showell/zulip,brockwhittaker/zulip,Galexrt/zulip,dhcrzf/zulip,brainwane/zulip