chore: enable increment-decrement from revive

Signed-off-by: Matthieu MOREL <matthieu.morel35@gmail.com>

.golangci.yaml

@@ -257,7 +257,6 @@ linters-settings:
       - name: errorf
         disabled: true
       - name: increment-decrement
-        disabled: true
       - name: indent-error-flow
         disabled: true
       - name: range

pkg/util/csi/volume_snapshot.go

@@ -425,7 +425,7 @@ func GetVolumeSnapshotClassForStorageClass(
 	for _, sc := range snapshotClasses.Items {
 		_, hasLabelSelector := sc.Labels[velerov1api.VolumeSnapshotClassSelectorLabel]
 		if sc.Driver == provisioner {
-			n += 1
+			n++
 			vsClass = sc
 			if hasLabelSelector {
 				return &sc, nil