update gather abfe and septop min openfe versions

[atravitz]

I copy/pasted from gather.py when originally adding these and didn't update the min required openfe versions.

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• All new code is appropriately documented (user-facing code must have complete docstrings).
• Added a news entry, or the changes are not user-facing.
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• GPU integration tests
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[atravitz]

(failing tests will be resolved by #2169)