Update master for stable/2023.2

Add file to the reno documentation build to show release notes for
stable/2023.2.

Use pbr instruction to increment the minor version number
automatically so that master versions are higher than the versions on
stable/2023.2.

Sem-Ver: feature
Change-Id: I9fb38332ffd040768e57c6c44d2f6d9ff2c0d38c