chore: fix linting issues exposed by fixing golangci-lint (#12895)

Co-authored-by: Marko <marbar3778@yahoo.com>
Co-authored-by: Julien Robert <julien@rbrt.fr>

tests/e2e/bank/client/suite.go

@@ -2,7 +2,7 @@ package client
 
 import (
 	"fmt"
-	"io/ioutil"
+	"io"
 	"os"
 
 	"github.com/gogo/protobuf/proto"
@@ -419,7 +419,7 @@ func (s *EndToEndTestSuite) TestNewSendTxCmdDryRun() {
 	s.Require().NoError(err)
 
 	w.Close()
-	out, _ := ioutil.ReadAll(r)
+	out, _ := io.ReadAll(r)
 	os.Stderr = oldSterr
 
 	s.Require().Regexp("gas estimate: [0-9]+", string(out))

tests/e2e/client/grpc/tmservice/service_test.go

@@ -31,7 +31,6 @@ type IntegrationTestSuite struct {
 }
 
 func TestIntegrationTestSuite(t *testing.T) {
-
 	suite.Run(t, new(IntegrationTestSuite))
 }