Update dependency alembic to v1.20.0

[red-hat-konflux]

This PR contains the following updates:

Package	Change	Age	Confidence
alembic (changelog)	==1.19.2 → ==1.20.0

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Documentation

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[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This dependency-only PR updates the backend’s pinned Alembic version from 1.19.2 to 1.20.0; review should focus on compatibility and the results of the project’s test and migration checks.

File-Level Changes

Change	Details	Files
Upgrade the pinned Alembic dependency to the 1.20.0 release.	Replace the exact Alembic pin from 1.19.2 to 1.20.0.	backend/requirements-pinned.txt

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.42%. Comparing base (b35aa46) to head (2669853).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1132   +/-   ##
=======================================
  Coverage   87.42%   87.42%           
=======================================
  Files          63       63           
  Lines        3737     3737           
  Branches      697      697           
=======================================
  Hits         3267     3267           
  Misses        262      262           
  Partials      208      208           

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