test_email_mirror: Clean up unnecessary use of "type: Any" on MIMEText.
test_email_mirror: Clean up unnecessary use of "type: Any" on MIMEText.

The explanation on those type declarations referenced issue
https://github.com/python/typeshed/issues/275,
which has now been resolved.

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