fix: remove gin index on crdb

[aeneasr]

Related issue(s)

Checklist

• I have read the contributing guidelines.
• I have referenced an issue containing the design document if my change
  introduces a new feature.
• I am following the
  contributing code guidelines.
• I have read the security policy.
• I confirm that this pull request does not address a security
  vulnerability. If this pull request addresses a security vulnerability, I
  confirm that I got the approval (please contact
  security@ory.sh) from the maintainers to push
  the changes.
• I have added tests that prove my fix is effective or that my feature
  works.
• I have added or changed the documentation.

Further Comments

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.01%. Comparing base (5aad1c1) to head (9687f1c).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3846      +/-   ##
==========================================
+ Coverage   77.95%   78.01%   +0.06%     
==========================================
  Files         359      359              
  Lines       25203    25203              
==========================================
+ Hits        19646    19662      +16     
+ Misses       4049     4034      -15     
+ Partials     1508     1507       -1     

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