[#1341] .golangci.yml: Replace exportloopref with copyloopvar

exportloopref is deprecated.
gopatch:
```
@@
var index, value identifier
var slice expression
@@
for index, value := range slice {
...
-value := value
...
}

@@
var index, value identifier
var slice expression
@@
for index, value := range slice {
...
-index := index
...
}

@@
var value identifier
var channel expression
@@
for value := range channel {
...
-value := value
...
}
```

Signed-off-by: Evgenii Stratonikov <e.stratonikov@yadro.com>

pkg/local_object_storage/blobstor/info.go

@@ -43,7 +43,6 @@ func (b *BlobStor) ObjectsCount(ctx context.Context) (uint64, error) {
 
 	eg, egCtx := errgroup.WithContext(ctx)
 	for i := range b.storage {
-		i := i
 		eg.Go(func() error {
 			v, e := b.storage[i].Storage.ObjectsCount(egCtx)
 			if e != nil {