chore: relocated 5.0 upload script to src/scripts/

Felt odd to have a script sitting in the root of the repo.
This relocates it to `src/scripts/`, which is technically odd
because it's a Python script not a JavaScript one, but this is
already a grab-bag of miscellaneous scripts that get run during
development, so I think it's fine.

Signed-off-by: Andrew Lilley Brinker <abrinker@mitre.org>

Author: alilleybrinker