fix: remove unnecessary postgres req

[MDunitz]

Reviewers

Functional:

• @maniarathi
  Readability:

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Changes

• remove unnecessary postgres dependency

[codecov]

Codecov Report

Merging #2524 (bc8f670) into main (de44739) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #2524   +/-   ##
=======================================
  Coverage   71.64%   71.64%           
=======================================
  Files          94       94           
  Lines        6464     6464           
  Branches      738      738           
=======================================
  Hits         4631     4631           
  Misses       1757     1757           
  Partials       76       76           

Flag	Coverage Δ
frontend	71.64% <ø> (ø)
javascript	71.64% <ø> (ø)
smokeTestAnnotations	?
unitTest	71.64% <ø> (ø)

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[maniarathi]

LGTM. This dependency appears to have been added in this PR when we added the DB for supporting annotations in the hosted version of cellxgene. That code is now split out into its own repo and there is no longer any additional need to support that DB in this version of cellxgene.