mypy: Remove need for cast by using ConcreteQueueWorker TypeVar.
mypy: Remove need for cast by using ConcreteQueueWorker TypeVar.

punchagan/zulip,rht/zulip,dhcrzf/zulip,timabbott/zulip,eeshangarg/zulip,synicalsyntax/zulip,jackrzhang/zulip,kou/zulip,andersk/zulip,tommyip/zulip,rht/zulip,eeshangarg/zulip,zulip/zulip,showell/zulip,andersk/zulip,jackrzhang/zulip,hackerkid/zulip,timabbott/zulip,punchagan/zulip,andersk/zulip,zulip/zulip,tommyip/zulip,zulip/zulip,andersk/zulip,dhcrzf/zulip,punchagan/zulip,showell/zulip,dhcrzf/zulip,synicalsyntax/zulip,kou/zulip,rishig/zulip,brainwane/zulip,rht/zulip,timabbott/zulip,brainwane/zulip,tommyip/zulip,shubhamdhama/zulip,rht/zulip,andersk/zulip,showell/zulip,timabbott/zulip,showell/zulip,punchagan/zulip,rht/zulip,brainwane/zulip,showell/zulip,rishig/zulip,zulip/zulip,tommyip/zulip,shubhamdhama/zulip,hackerkid/zulip,tommyip/zulip,tommyip/zulip,punchagan/zulip,jackrzhang/zulip,punchagan/zulip,shubhamdhama/zulip,synicalsyntax/zulip,zulip/zulip,synicalsyntax/zulip,dhcrzf/zulip,eeshangarg/zulip,rishig/zulip,jackrzhang/zulip,tommyip/zulip,kou/zulip,eeshangarg/zulip,zulip/zulip,shubhamdhama/zulip,andersk/zulip,brainwane/zulip,rishig/zulip,shubhamdhama/zulip,eeshangarg/zulip,rht/zulip,showell/zulip,showell/zulip,rht/zulip,timabbott/zulip,synicalsyntax/zulip,rishig/zulip,hackerkid/zulip,timabbott/zulip,hackerkid/zulip,synicalsyntax/zulip,punchagan/zulip,brainwane/zulip,timabbott/zulip,kou/zulip,jackrzhang/zulip,synicalsyntax/zulip,brainwane/zulip,dhcrzf/zulip,eeshangarg/zulip,hackerkid/zulip,hackerkid/zulip,dhcrzf/zulip,rishig/zulip,brainwane/zulip,kou/zulip,hackerkid/zulip,shubhamdhama/zulip,shubhamdhama/zulip,kou/zulip,jackrzhang/zulip,andersk/zulip,zulip/zulip,kou/zulip,jackrzhang/zulip,rishig/zulip,dhcrzf/zulip,eeshangarg/zulip