[py] Upgrade dependencies for mypy tox environment (#15642)

Author: cgoldberg

py/tox.ini

@@ -25,11 +25,11 @@ setenv =
 [testenv:mypy]
 skip_install = true
 deps =
-  mypy==1.4.1
-  lxml==4.9.1
+  mypy==1.15.0
+  lxml==5.3.2
   types-urllib3==1.26.25
   types-certifi==2021.10.8.3
-  trio-typing==0.7.0
+  trio-typing==0.10.0
 commands = mypy --install-types {posargs}
 
 [testenv:linting-ci]