fix(compoundtypesplitter): handle class names with digits

[lucsorel]

py2puml should handle class names that include digits, like:

class int64:
    def __init__(self, value: int) -> None:
        self.value: int = value

class Main:
    def __init__(self):
        self.a: list[int64] = [int64(0)] * 5

[anaellorimier]

this should be 0.6.0

[anaellorimier]

Little typo in the changelog, otherwise it looks good to me !

[lucsorel]

thanks @anaellorimier for the review. I fixed the changelog. Can you resume the review, please?