get_frozen.py: add comment line to each file with the micropython version it was generated from

[Josverl]

    # todo: add comment line to each file with the micropython version it was generated from

micropython-stubber/src/stubber/freeze/get_frozen.py

Line 56 in f914846

- repos should be cloned side-by-side as some of the manifests refer to micropython-lib scripts using a relative path