This is an error in Python 3.12; fix it by using a raw string literal.
Cc: qemu-stable@nongnu.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
(cherry picked from commit e41c40d101fce79af4d679955eb6e0d31e02c47c)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>