Use new Python 3.12 f-string syntax

[CarrotManMatt]

Now that we have updated this project to use Python 3.12 (#124), all multi-line f-strings should be updated to use the new syntax.

For example:

my_var: str = (
    f"""This is a {
        random.choice("good", "amazing", "wonderful")
    }. My next random number will be provided below in due course: {
        random.choice(
            999_999_999_999_999,
            420,
            10,
            0
        )
        if random.randint(0, 101) == 69
        else random.random()
    }"""
)

Would be changed to:

my_var: str = (
    f"This is a {random.choice("good", "amazing", "wonderful")}. "
    "My next random number will be provided below in due course: "
    f"{
        random.choice(
            999_999_999_999_999,
            420,
            10,
            0
        )
        if random.randint(0, 101) == 69
        else random.random()
    }"
)

(I am aware that this example can be simplified on to a single line without the line-length being exceeded, however this is just an example. Use the shown changes to help when the changed lines do exceed the maximum allowed line-length.)