Update master for stable/2025.2

Add file to the reno documentation build to show release notes for
stable/2025.2.

Use pbr instruction to increment the minor version number
automatically so that master versions are higher than the versions on
stable/2025.2.

Sem-Ver: feature
Change-Id: I3ab48efc8208b791bfdf5ac24d098b8e236d7031
Signed-off-by: OpenStack Release Bot <infra-root@openstack.org>
Generated-By: openstack/project-config:roles/copy-release-tools-scripts/files/release-tools/add_release_note_page.sh

releasenotes/source/2025.2.rst

@@ -0,0 +1,6 @@
+===========================
+2025.2 Series Release Notes
+===========================
+
+.. release-notes::
+   :branch: stable/2025.2

releasenotes/source/index.rst

@@ -6,6 +6,7 @@
    :maxdepth: 1
 
    current
+   2025.2
    2025.1
    2024.2
    2024.1