Improve psalm types for `DatabaseInterface::transaction()`

[vjik]

What was changed

Add more specific type for "DatabaseInterface::transaction()".

Why?

Psalm error in app. I am waiting callback result as method result.

Checklist

• How was this tested: psalm (count errors same before and after)
• Any docs updates needed? No

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 95.23%. Comparing base (f9f70c8) to head (5dadc8d).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## 2.x #163 +/- ## ========================================= Coverage 95.23% 95.23% Complexity 1833 1833 ========================================= Files 130 130 Lines 5054 5054 ========================================= Hits 4813 4813 Misses 241 241 ```

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[vjik]

Please fill the form in the PR description

Done

[roxblnfk]

Thanks