Remove testing support for postgres 11
What does this MR do and why?
Removes testing support for postgres 11 since we no longer need to support it.
Relates to Remove pg11 specs (#387843 - closed)
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Edited by Matt Kasa