bpo-41084: Adjust message when an f-string expression causes a SyntaxError (GH-21084)


Prefix the error message with `fstring: `, when parsing an f-string expression throws a `SyntaxError`.
(cherry picked from commit 2e0a920e9eb540654c0bb2298143b00637dc5961)

Co-authored-by: Lysandros Nikolaou <lisandrosnik@gmail.com>
3 files changed