Manage version bump of EpiNow2

[zsusswein]

We need to move to a newer release, once we have deterministic output

[kgostic]

Adding that the new version expects a 0-indexed GI, which will be another breaking change. See: https://github.com/cdcent/cfa-parameter-estimates/issues/48#issuecomment-2383113839

If we need to move to a 0-indexed GI, this will also touch the cdcent/cfa-parameters repo, and STF's work, so please coordinate with all the appropriate stakeholders