feat: add changeset

Signed-off-by: Shamil Ganiev <ganiev@pm.me>

Author: ganievs

.changeset/bump-backstage-1.50.3.md

@@ -0,0 +1,9 @@
+---
+'@platacard/backstage-plugin-scaffolder-backend-module-json-merge-action': patch
+'@platacard/backstage-plugin-scaffolder-backend-module-yaml-merge-actions': patch
+---
+
+Upgrade Backstage to 1.50.3. Migrated the `scaffolderActionsExtensionPoint`
+import from `@backstage/plugin-scaffolder-node/alpha` to
+`@backstage/plugin-scaffolder-node` now that it is stable. No behavior or API
+changes for adopters.