Add changeset for volume-2 icon rename (#3276)

Author: zamoore

.changeset/sweet-mangos-relate.md

@@ -0,0 +1,7 @@
+---
+"@hashicorp/design-system-components": major
+---
+
+<!-- START components/icon -->
+`Icon` - Renamed the `volume-2` icon to `volume-up`
+<!-- END -->