Bug 1560911 [wpt PR 17405] - Update mypy to 0.710, a=testonly

Automatic update from web-platform-tests
Update mypy from 0.701 to 0.710 (#17405)

--

wpt-commits: eecf6c3158d229132698164e06b13e89657d1ea1
wpt-pr: 17405

testing/web-platform/tests/tools/requirements_mypy.txt

@@ -1,3 +1,3 @@
-mypy==0.701
+mypy==0.710
 mypy-extensions==0.4.1
 typed-ast==1.3.5