Add releasenote to tag the Tempest for 2024.2 release

Updating the doc for the same.

Change-Id: Id3f8d7fa8f344fc9b7df79637108f3522eb2e84f
diff --git a/doc/source/supported_version.rst b/doc/source/supported_version.rst
index 162a111..c4631d8 100644
--- a/doc/source/supported_version.rst
+++ b/doc/source/supported_version.rst
@@ -9,6 +9,7 @@
 
 Tempest master supports the below OpenStack Releases:
 
+* 2024.2
 * 2024.1
 * 2023.2
 * 2023.1