chore: Pin older style and type dependencies on maint branch

Author: effigies

tox.ini

@@ -142,7 +142,7 @@ commands =
 description = Check our style guide
 labels = check
 deps =
-  ruff>=0.3.0
+  ruff~=0.8.0
 skip_install = true
 commands =
   ruff check --diff nibabel
@@ -171,12 +171,12 @@ commands =
 description = Check type consistency
 labels = check
 deps =
-  mypy
+  mypy ~=1.14.0
   pytest
   types-setuptools
   types-Pillow
   pydicom
-  numpy
+  numpy ~=1.26.0
   pyzstd
   importlib_resources
   typing_extensions