[#1671] Use fmt.Appendf where warranted

Fix gopls warnings:
```
cmd/frostfs-adm/internal/modules/morph/config/config.go:68:20-64: Replace []byte(fmt.Sprintf...) with fmt.Appendf
````

gopatch:
```
@@
var f expression
@@
-[]byte(fmt.Sprintf(f, ...))
+fmt.Appendf(nil, f, ...)
```

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

pkg/local_object_storage/metabase/reset_test.go

@@ -37,7 +37,7 @@ func TestResetDropsContainerBuckets(t *testing.T) {
 	for idx := range 100 {
 		var putPrm PutPrm
 		putPrm.SetObject(testutil.GenerateObject())
-		putPrm.SetStorageID([]byte(fmt.Sprintf("0/%d", idx)))
+		putPrm.SetStorageID(fmt.Appendf(nil, "0/%d", idx))
 		_, err := db.Put(context.Background(), putPrm)
 		require.NoError(t, err)
 	}