Update windows to 0.39.0

[wravery]

What kind of change does this PR introduce?

• Bugfix
• Feature
• Docs
• New Binding issue #___
• Code style update
• Refactor
• Build-related changes
• Other, please describe:

Does this PR introduce a breaking change?

• Yes, and the changes were approved in issue #___
• No

Checklist

• When resolving issues, they are referenced in the PR's title (e.g fix: remove a typo, closes #___, #___)
• A change file is added if any packages will require a version bump due to this PR per the instructions in the readme.
• I have added a convincing reason for adding this feature, if necessary

Other information

The alloc feature has been removed, which means Win32 APIs no longer accept Rust String or &str parameters and implicitly convert them to PWSTR or PSTR.

For string literals, that feature was replaced with s!() and w!() macros which null terminate the string literal at compile time and convert to UTF-16 if necessary. The s!() macro is fine, however the w!() macro uses HSTRING types from WinRT for maximum compatibility with WinRT types. Since Tao only uses Win32 APIs (or dynamically loaded DLL entry-points), it still works on Win7, but I'm worried about taking any dependencies on HSTRING. Instead of the w!() macro, this change relies on the internal util::encode_wide function to convert to a Vec<u16> with the Rust standard library.

[wravery]

This should take care of #443 and #444.

[amrbashir]

Thank you