mypy argtype failure in ui_server.py with mypy>=1.11

Expected Behavior

Type checking should pass!

Current Behavior

With mypy 1.11

feast/ui_server.py:54: error: Argument 1 to "files" has incompatible type "str | None"; expected "str | Module"  [arg-type]
feast/ui_server.py:54: note: Error code "arg-type" not covered by "type: ignore" comment

Steps to reproduce

• Get your dev environment to the point where you can run make lint-python
• pip install --upgrade 'mypy>=1.11'
• make lint-python` --> the above error

Specifications

• Version: main

Possible Solution

Presumably mypy has identified a nullness bug, or a bug in itself.