CompatHelper: bump compat for BifurcationKit in [weakdeps] to 0.4, (keep existing compat)

[github-actions[bot]]

This pull request changes the compat entry for the BifurcationKit package from 0.3 to 0.3, 0.4. This keeps the compat entries for earlier versions.

Note: I have not tested your package with this new compat entry. It is your responsibility to make sure that your package tests pass before you merge this pull request.

[isaacsas]

This needs MTK to update to BifurcationKit .4 first

[isaacsas]

@TorkelE could you update the BifurcationKit extension now? MTK has updated to the newest version and dropped support for the version we have, giving us some issues (for example, we can't use the latest MTK anymore in our docs, and I guess maybe in our tests).

[ChrisRackauckas]

It's a breaking change too so supporting both is a bit hard, but we can have versioned @static if statements if it helps.

[isaacsas]

Only supporting 0.4 is fine; that wasn’t meant to be a complaint. We just need to update our wrapper around the MTK extension, and maybe the doc examples if the usage has changed. Since the next Catalyst is breaking it seems fine to drop v3 versions.