THREESCALE-11544: Set active_support.cache_format_version to 7.0

[jlledom]

What this PR does / why we need it:

Rails 7 is deployed and apparently everything went well. It doesn't seem we are rolling back, so we can set Rails cache format to 7.0

Which issue(s) this PR fixes

https://issues.redhat.com/browse/THREESCALE-11544

Verification steps

Everything should work as usual

[akostadinov]

Will this invalidate current sessions?

[akostadinov]

Probably not. Just a question which cache will be affected.

[jlledom]

Will this invalidate current sessions?

I don't think so, sessions are in DB, right?

[akostadinov]

right, do you know what does this cache break though? Just a question if you happen to know. I'll check out later if not.

[jlledom]

right, do you know what does this cache break though? Just a question if you happen to know. I'll check out later if not.

According to docs, nothing should break.

https://guides.rubyonrails.org/v7.0/upgrading_ruby_on_rails.html#new-activesupport-cache-serialization-format

Rails 7.0 is able to read both formats so the cache won't be invalidated during the upgrade.