feat: use log4j2 formatter

Author: jornfranke

backend/src/main/java/eu/zuinnote/example/springwebdemo/configuration/SecurityConfigurationOidc.java

@@ -154,7 +154,7 @@ private Set<GrantedAuthority> parseClaim(String type, String claim, Object claim
                                         .map(SimpleGrantedAuthority::new)
                                         .collect(Collectors.toCollection(HashSet::new)));
             } else { // unknown type of claim cannot be processed
-                this.log.error(String.format("Claim %s in %s has an unknown type", claim, type));
+                this.log.error("Claim {} in {} has an unknown type", claim, type);
             }
         }
         return result;