mypy-constrains.txt: bump mypy up to version 1.1.1

mypy-constrains.txt: bump mypy up to version 1.1.1

In PR #55255 I updated various files to be valid on newer versions of
mypy. Update the constrains file to specify mypy 1.1.1. This certainly
is not the newest version of mypy, but because ceph uses various older
versions of python I am being cautious and trying to only incrementally
update the mypy version. This version fixed an issue or two I hit while
working on a prototype manager module compared to the previous version
in the mypy-constrains.txt file.

Signed-off-by: John Mulligan <jmulligan@redhat.com>
(cherry picked from commit 6873a5c3840c929c9b76b413cdbb29bd8ea9274b)