Fix warning compiling for macOS 13

[jpsim]

Short description 📝

There's a deprecation warning when building with Xcode 14 targeting macOS 13:

Sources/XcodeProj/Extensions/String+md5.swift:63:16: warning: 'init(bytesNoCopy:length:encoding:freeWhenDone:)' was deprecated in macOS 13: String does not support no-copy initialization
        return String(bytesNoCopy: ptr, length: hexLen, encoding: .utf8, freeWhenDone: true)!
               ^

This is because String.init(bytesNoCopy:...) was deprecated in macOS 13: https://developer.apple.com/documentation/swift/string/init(bytesnocopy:length:encoding:freewhendone:)

Further discussion here: https://forums.swift.org/t/does-string-bytesnocopy-copy-bytes/51643/11

Solution 📦

Use String.init(cString:) instead.

Implementation 👩‍💻👨‍💻

• [x] Use String.init(cString:) instead of String.init(bytesNoCopy:...)
• [x] Deallocate bytes from pointer after creating the string

[jpsim]

I made a few updates after realizing that the initial code wasn't safe. Should be good to go now.

[jpsim]

CI didn't run on the latest commits of this PR.

Tests failed on main, but they pass for me locally when running swift test with Xcode 14b4.

[kwridan]

Sorry folks had to revert this 😞 as it was causing some reference generation instability (tests caught this when run repeatedly)

[jpsim]

I understand. I don't see how what I wrote is unsafe, but it clearly is.