fix(channels): use SQL function for psycopg

[cofin]

Description

This PR updates the channels backend to use the native psycopg SQL API.

Additionally, it preemptively fixes some new warnings from upcoming pyright and ruff changes

Closes

[cofin]

@provinzkraut Any ideas why these may be hanging now? I wouldn't have expected this change to use the built-in query helpers to have impacted this, but maybe so.

[provinzkraut]

@provinzkraut Any ideas why these may be hanging now? I wouldn't have expected this change to use the built-in query helpers to have impacted this, but maybe so.

Unfortunately no. Have you tried debugging the response from psycopg? Maybe it errors out weirdly and that causes our tests to get stuck waiting for something from a listener?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.36%. Comparing base (b3f2c5b) to head (b10b5e4).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3916   +/-   ##
=======================================
  Coverage   98.36%   98.36%           
=======================================
  Files         346      346           
  Lines       15689    15690    +1     
  Branches     1737     1737           
=======================================
+ Hits        15432    15433    +1     
  Misses        122      122           
  Partials      135      135           

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[github-actions]

Documentation preview will be available shortly at https://litestar-org.github.io/litestar-docs-preview/3916