fix(deps): update module github.com/crc-org/vfkit to v0.6.1

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

vendor/github.com/crc-org/vfkit/pkg/config/json.go

@@ -22,6 +22,7 @@ const (
 	vfBlk          vmComponentKind = "virtioblk"
 	vfFs           vmComponentKind = "virtiofs"
 	vfRng          vmComponentKind = "virtiorng"
+	vfBalloon      vmComponentKind = "virtioballoon"
 	vfSerial       vmComponentKind = "virtioserial"
 	vfGpu          vmComponentKind = "virtiogpu"
 	vfInput        vmComponentKind = "virtioinput"
@@ -159,6 +160,10 @@ func unmarshalDevice(rawMsg json.RawMessage) (VirtioDevice, error) {
 		var newDevice VirtioRng
 		err = json.Unmarshal(rawMsg, &newDevice)
 		dev = &newDevice
+	case vfBalloon:
+		var newDevice VirtioBalloon
+		err = json.Unmarshal(rawMsg, &newDevice)
+		dev = &newDevice
 	case vfSerial:
 		var newDevice VirtioSerial
 		err = json.Unmarshal(rawMsg, &newDevice)
@@ -346,6 +351,17 @@ func (dev *VirtioRng) MarshalJSON() ([]byte, error) {
 	})
 }
 
+func (dev *VirtioBalloon) MarshalJSON() ([]byte, error) {
+	type devWithKind struct {
+		jsonKind
+		VirtioBalloon
+	}
+	return json.Marshal(devWithKind{
+		jsonKind:      kind(vfBalloon),
+		VirtioBalloon: *dev,
+	})
+}
+
 func (dev *VirtioSerial) MarshalJSON() ([]byte, error) {
 	type devWithKind struct {
 		jsonKind