add basic 3.12 support releasenote

.riot/requirements/releasenotes/notes/3.12_support-422a62d1871877c2.yaml

@@ -0,0 +1,14 @@
+---
+prelude: >
+    We added support for Python 3.12 but (add caveats)
+
+features:
+  - |
+    Adds support for Python 3.12
+issues:
+  - |
+    List known issues here, or remove this section.  All of the list items in
+    this section are combined when the release notes are rendered, so the text
+    needs to be worded so that it does not depend on any information only
+    available in another section, such as the prelude. This may mean repeating
+    some details.