Add changeset for versioning strategy

.changeset/old-mayflies-sing.md

@@ -0,0 +1,19 @@
+---
+"@open-pioneer/authentication": patch
+"@open-pioneer/authentication-keycloak": patch
+"@open-pioneer/base-theme": patch
+"@open-pioneer/chakra-integration": patch
+"@open-pioneer/core": patch
+"@open-pioneer/http": patch
+"@open-pioneer/integration": patch
+"@open-pioneer/local-storage": patch
+"@open-pioneer/notifier": patch
+"@open-pioneer/react-utils": patch
+"@open-pioneer/reactivity": patch
+"@open-pioneer/runtime": patch
+"@open-pioneer/runtime-react-support": patch
+"@open-pioneer/test-utils": patch
+---
+
+Switch to a new versioning strategy.
+From now on, packages released by this repository share a common version number.