interp: here-doc backslash is not preserved

When a backslash is present inside here-doc it is not preserved in the output(input). See the difference with bash below:

gosh
$ cat << EOF
> test \" test
> EOF
test " test

bash
bash-3.2$ cat << EOF
> test \" test
> EOF
test \" test

Relates to:

Thanks, this looks like a bug in the parser. I didn't know that heredocs treat backslashes unlike any other part of the language.

expand: don't unescape characters inside here-documents

expand: heredocs unescape \$, \\, and \`, just not \"

chore(deps): update module mvdan.cc/sh/v3/cmd/shfmt to v3.12.0 (hetzn…

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