Dasel: Index-out-of-range panic in dasel selector lexer on trailing backslash in quoted string

Summary dasel's selector lexer panics with an index-out-of-range error when tokenizing a quoted string that ends with a trailing backslash e.g., "\ or '. A 2-byte input causes an immediate process crash via Go runtime panic. I confirmed the issue on v3.3.1 fba653c7f248aff10f2b89fca93929b64707dfc8...