jsonb / postgres 9.4+ required in 11.7 to 11.8 upgrade

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References

Merged MR that introduced documentation requiring review:

https://gitlab.com/gitlab-org/gitlab-ce/blob/11-8-stable/doc/update/11.7-to-11.8.md

Related issue(s):

Upgrade docs should mention that minimum of postrgess 9.4 is required since jsonb feature is introduced on with that rev.

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