Fix absolute paths in secrets and inherited volumes

[oldium]

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Volumes detect and handle unix-like absolute paths also on Windows. Secrets are translated to bind mounts, so handle them the same way. While at it, fix also inherited absolute path volumes from extended services.

Fixes #304

[oldium]

Tested also in github.com/docker/compose with changed go.mod to replace github.com/compose-spec/compose-go with github.com/oldium/compose-go (latest fix-abs-paths branch commit) and issue #304 is really fixed for me.