Fix linter warnings

`golangci-lint` showed warnings for using an "omitempty" on a struct
type (which does not have any effect) and an unknown linter "golint".
These are fixed by this change.

Author: felix-kaestner

internal/provider/cisco/nxos/grpc.go

@@ -19,7 +19,7 @@ var (
 
 // GRPC represents the gRPC configuration on a NX-OS device.
 type GRPC struct {
-	Cert           Option[string] `json:"cert,omitempty"`
+	Cert           Option[string] `json:"cert,omitzero"`
 	CertClientRoot string         `json:"certClientRoot,omitempty"`
 	Port           int32          `json:"port"`
 	UseVrf         string         `json:"useVrf,omitempty"`

test/e2e/util.go

@@ -12,7 +12,7 @@ import (
 	"os/exec"
 	"strings"
 
-	. "github.com/onsi/ginkgo/v2" //nolint:golint,revive
+	. "github.com/onsi/ginkgo/v2" //nolint:revive
 )
 
 const (