gcov detection fails on Windows if version is found at end of line

[mitchgrout]

gcov::parse_version currently splits words using either whitepace or newlines, but does not account for carriage returns. This can lead to failures to detect valid gcov binaries on Windows. Example using the w64devkit bundled version of gcov:

$ gcov --version | head -n1
gcov (GCC) 14.1.0

$ gcov --version | head -n1 | xxd -c20
00000000: 6763 6f76 2028 4743 4329 2031 342e 312e 300d 0a    gcov (GCC) 14.1.0..

The gathered versions are ["gcov", "(GCC)", "14.1.0<CR>"], all of which fail Version::parse

This could be fixed by adding '\r' into this list, or by using char.is_whitespace or char.is_ascii_whitespace