fix awkward formatting w/ auto-wrap

alternatively, we could put the + on the beginning of the other line
but in this case it's easiest to just omit it

setupsrc/pypdfium2_setup/autorelease.py

@@ -190,7 +190,7 @@ def main():
         parsed_helpers = parse_git_tag()
         if new_helpers != parsed_helpers:
             print(
-                "Warning: Written and parsed helpers do not match. This should not happen in CI.\n" +
+                "Warning: Written and parsed helpers do not match. This should not happen in CI.\n"
                 f"In: {new_helpers}\n" + f"Out: {parsed_helpers}"
             )
     make_releasenotes(summary, record["pdfium"], new_pdfium, prev_tag, new_tag, c_updates)