Otherwise symbolic links may also accidentally be resolved which may
lead to unexpected results in the case of 'coreutils', a binary
that depends on the executable name being a symbolic link.

This means a path like /bin/echo being canonicalized to /bin/coreutils
will loose all information about the desired functionality.

Test failures will occur if 'echo' is resolved that way and it's
not trivial to find the cause of it in the provided error messages.

…looking if it does.

Bump to 0.59.0, update changelog

This didn't actually result in any code changes yet, for now this simply
flips the edition flag for all of our crates and documentation.

Most of these are pretty dated and Cargo defaults nowadays to not
emitting an `authors` field so this commit also removes them from the
manifests.

And here is why: #9991 (comment)

…r=joshtriplett

Don't canonicalize executable path

Otherwise symbolic links may also accidentally be resolved which may lead to unexpected results in the case of 'coreutils', a binary that depends on the executable name being a symbolic link.

This means a path like /bin/echo being canonicalized to /bin/coreutils will loose all information about the desired functionality.

For example, test failures will occur if 'echo' is resolved that way and it's not trivial to find the cause of it in the provided error messages.  For example`doc_workspace_open_different_library_and_package_names` did fail for me on MacOS, Nix packages in PATH, but works with this patch.

With this patch, there is still the possibility that a path gets canonicalized for its relative path components, but still results in changing the name of the binary. I could imagine to check for binary name changes and panic if `coreutils` or `busybox` is encountered, which are known to fail without a symlink telling them which program to emulate.

Upgrade Cargo to the 2021 edition

While I was poking around in the manifests I also went ahead and removed the `authors` entries since at least the one for Cargo itself is quite outdated and Cargo otherwise doesn't use these any more.

Fix a clippy warning

This pull request fixes a clippy warning.