fix: don't allow newlines in interpreted_string_literal

[guilhas07]

Problem:
interpreted_string_literal doesn't support multiline.
When trying to parse:

{{ "foo
"}}

Go fails with unterminated quoted string.

Solution:
Add token.immediate to the closing string delimiter.

[qvalentin]

Seems reasonable, but please shortly explain why the change is required.

Seems like templating would fail with the message "unterminated quoted string".

[guilhas07]

Seems reasonable, but please shortly explain why the change is required.

Seems like templating would fail with the message "unterminated quoted string".

Updated PR description, and pushed with the helm build.