Fix existential-any for Swift6
Added any to each protocols to resolve existential-any build errors on Swift 6.
https://github.com/swiftlang/swift-evolution/blob/main/proposals/0335-existential-any.md
Thanks for your PR. This is no problem for Swift 6, but we need to consider the support versions of Swift.
I'm planning to support Swift 6 on swift-6 branch which will bump up the minimum support Swift version, Xcode and iOS, and then will be released in v2.9.0 or v3.0.0,
I'm welcome this PR's target branch to swift-6 branch. a862b4d should be ok just for the branch.
And then if you would, I'm happy to change SWIFT_UPCOMING_FEATURE_EXISTENTIAL_ANY = YES; in the FloatingPanel project file.
Rebase on swift-6 branch and change target branch to swift-6.
Also added upcoming feature to the project file.
Thanks for your work.