fix: don't treat closing quote as escaped after an escaped backslash#262
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When scanning for a quoted value's terminator, a closing quote was skipped whenever the preceding byte was a backslash, even if that backslash was itself escaped, so
FOO="bar\\"failed with "unterminated quoted value". The quote is now considered escaped only when preceded by an odd number of backslashes, matching the behaviour of the reference dotenv parsers. Closes #225