[TEST] Use scram pass for auth query

[dragomirp]

Issue

Solution

[codecov]

Codecov Report

Attention: Patch coverage is 23.07692% with 10 lines in your changes missing coverage. Please review.

Project coverage is 68.17%. Comparing base (9fff234) to head (9c5ac76).

Files	Patch %	Lines
src/relations/backend_database.py	0.00%	9 Missing ⚠️
lib/charms/pgbouncer_k8s/v0/pgb.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #313      +/-   ##
==========================================
- Coverage   70.35%   68.17%   -2.18%     
==========================================
  Files           8        8              
  Lines        1167     1172       +5     
  Branches      213      214       +1     
==========================================
- Hits          821      799      -22     
- Misses        269      300      +31     
+ Partials       77       73       -4     

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