chore(ci): Move to release-plz

Remove home-rolled automated release scripts in
favor of release-plz

Author: jbeaurivage

.github/actions/sync-bsp-versions/action.yml

@@ -0,0 +1,7 @@
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    # Check for updates every Monday
+    schedule:
+      interval: "weekly"