Create releasenotes page for tempest 42.0.0/43.0.0

Depends-On: https://review.opendev.org/c/openstack/releases/+/945153
Change-Id: I844278f48fb77efb15366c3410256ba1c9876eea
diff --git a/releasenotes/source/index.rst b/releasenotes/source/index.rst
index 633d90e..058f65f 100644
--- a/releasenotes/source/index.rst
+++ b/releasenotes/source/index.rst
@@ -6,6 +6,8 @@
    :maxdepth: 1
 
    unreleased
+   v43.0.0
+   v42.0.0
    v41.0.0
    v40.0.0
    v39.0.0