Build broken with JDK 21

[stefanofornari]

I have pulled main and one test does not compile:

Error:

reference to exists is ambiguous
  both method exists(Path,LinkOption...) in FileSystemProvider and method exists(S3AsyncClient,S3Path) in S3FileSystemProvider match

I will provide a PR

[stefanofornari]

Sorry, as usual, I deleted the branch before PR is merged...