ethdb/pebble: add Errorf function to panicLogger (#28491)

cockroachdb/pebble@422dce9 added Errorf to the Logger interface, this change makes it possible to compile geth with that version of pebble by adding the corresponding method to panicLogger.

ethdb/pebble/pebble.go

@@ -127,6 +127,9 @@ type panicLogger struct{}
 func (l panicLogger) Infof(format string, args ...interface{}) {
 }
 
+func (l panicLogger) Errorf(format string, args ...interface{}) {
+}
+
 func (l panicLogger) Fatalf(format string, args ...interface{}) {
 	panic(errors.Errorf("fatal: "+format, args...))
 }