Update git submodules
* Update oslo.middleware from branch 'master'
to 4ba32edec7feca6a0b5fcf4e004c62340e3afd66
- Merge "Use upper-constraint in doc generation"
- Use upper-constraint in doc generation
Currently doc jobs are broken because the latest sphinx 7.2.0 is not
compatible with the latest release of openstackdocstheme.
This updates the docs/releasenotes target to use the global upper
constraints to avoid that issue.
Change-Id: I8aeae9a380c4560c52bc13abd1745d69845071a0
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