lint - fix fstring

Author: dustinbleile

pori_python/graphkb/util.py

@@ -254,7 +254,7 @@ def login(self, username: str, password: str, pori_demo: bool = False) -> None:
 
         # KBDEV-1328. Alt. GraphKB login for GSC's PORI online demo
         if self.url and (pori_demo or "pori-demo" in self.url):
-            logger.warning(f"login demo")
+            logger.warning("login demo")
             self.login_demo()
 
         # use requests package directly to avoid recursion loop on login failure