feat(serverless_sqldb): add support for PostgreSQL version

[scaleway-bot]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 22 lines in your changes missing coverage. Please review.
✅ Project coverage is 50.77%. Comparing base (eb65e6b) to head (b877868).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
.../serverless_sqldb/v1alpha1/serverless_sqldb_cli.go	0.00%	12 Missing ⚠️
...namespaces/key_manager/v1alpha1/key_manager_cli.go	0.00%	10 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6122      +/-   ##
==========================================
- Coverage   50.78%   50.77%   -0.02%     
==========================================
  Files         359      359              
  Lines       82294    82314      +20     
==========================================
  Hits        41797    41797              
- Misses      40497    40517      +20     

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