Merge pull request #5862 from ethereum-optimism/fix/proposer-error-message

op-proposer: log address on failed contract bindings

op-proposer/proposer/l2_output_submitter.go

@@ -187,7 +187,7 @@ func NewL2OutputSubmitter(cfg Config, l log.Logger, m metrics.Metricer) (*L2Outp
 	l2ooContract, err := bindings.NewL2OutputOracleCaller(cfg.L2OutputOracleAddr, cfg.L1Client)
 	if err != nil {
 		cancel()
-		return nil, err
+		return nil, fmt.Errorf("failed to create L2OO at address %s: %w", cfg.L2OutputOracleAddr, err)
 	}
 
 	cCtx, cCancel := context.WithTimeout(ctx, cfg.NetworkTimeout)