chore: add changie entry for hc-install v0.9.4 bump (#590)

Author: ansgarm

.changes/unreleased/BUG FIXES-20260420-160827.yaml

@@ -0,0 +1,5 @@
+kind: BUG FIXES
+body: 'deps: bump github.com/hashicorp/hc-install to v0.9.4'
+time: 2026-04-20T16:08:27.534959+02:00
+custom:
+    Issue: "589"