mypy: config: use mypy_path=src  (#6222)
mypy: config: use mypy_path=src  (#6222)


The-Compiler/pytest,nicoddemus/pytest,The-Compiler/pytest,alfredodeza/pytest,Akasurde/pytest,nicoddemus/pytest,pytest-dev/pytest,markshao/pytest,RonnyPfannschmidt/pytest