[3.13] gh-132769: Refactor possible read-out-of-bounds in lexer.c
(GH-132770)
#132788
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(cherry picked from commit ea8ec95)
Co-authored-by: sobolevn mail@sobolevn.me
tok_mode->last_expr_buffer[i] != '\0' && i < input_length
is not safe #132769