[#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/writecache/flush_test.go

@@ -170,7 +170,6 @@ func runFlushTest[Option any](
 
 	t.Run("ignore errors", func(t *testing.T) {
 		for _, f := range failures {
-			f := f
 			t.Run(f.Desc, func(t *testing.T) {
 				errCountOpt, errCount := errCountOption()
 				wc, bs, mb := newCache(t, createCacheFn, smallSize, errCountOpt)