Add PG 16 compatibility

[marceloneppel]

Issue

Solution

[codecov]

Codecov Report

❌ Patch coverage is 61.90476% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 70.69%. Comparing base (f78ddf7) to head (1646e99).

Files with missing lines	Patch %	Lines
src/relations/backend_database.py	62.50%	3 Missing ⚠️
src/relations/db.py	50.00%	2 Missing and 1 partial ⚠️
src/relations/pgbouncer_provider.py	71.42%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #631      +/-   ##
==========================================
- Coverage   70.90%   70.69%   -0.21%     
==========================================
  Files           9        9              
  Lines        1416     1430      +14     
  Branches      233      234       +1     
==========================================
+ Hits         1004     1011       +7     
- Misses        311      317       +6     
- Partials      101      102       +1     

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