fix: Faker seed should be random

[abraemer]

Summary of changes

• changes the seeding of Faker to guarantee a random seed for every run

Context and reason for change

The strength of Faker is the random generation of valid inputs. With a fixed seed this advantage is lost. For incomprehensible reasons, there was no randomization taking place. This PR fixes that be altering the setup slightly.

How the changes can be tested

Dump a few generated documents, e.g. by putting this snippet:

def test_generate(scancode_faker: ScanCodeFaker) -> None:
    scancode_data = scancode_faker.scancode_data()
    seed = int(datetime.now().timestamp())
    with open(f"generated_scancode-{seed}.json", "w") as out:
        out.write(scancode_data.model_dump_json(indent=4))

at the end of tests/input_formats/scancode/services/test_convert_to_opossum.py and running it a couple of times.
Before this change, this yields identical files. After this change, the file is different everytime.

[Hellgartner]

LGTM

Will need a quick review after the final test fix ...