Update ~~current~~ next stack version to 9.2

[nastasha-solomon]

⚠️ DO NOT MERGE UNTIL RELEASE DATE ⚠️
Bumps the docs version to 9.2

Bumps the next stack version to 9.2 to update the branches being built to staging.

[colleenmcginnis]

I think we actually want to do this and deploy these changes now to start building to staging from the 9.2 branch while continuing to build to prod from 9.1 and keeping stack.current in config/versions.yml at 9.1.4.

[nastasha-solomon]

@colleenmcginnis couple of follow up questions:

• Should I merge this PR now or relatively soon?
• Will I need to open a separate PR the day before the release that does following:
  • Updates the Assembler config file changing the shared_configuration.stack.next to main
  • Updates the versions config file changing versioning_systems.stack.current to the minor version about to be released (so 9.2)

[colleenmcginnis]

Should I merge this PR now or relatively soon?

Yes. It should be merged as soon as possible to ensure that the there will be no build errors on the day of the 9.2 release.

Will I need to open a separate PR the day before the release that does following:

Yes, as detailed in the minor release issue template.