ci: pin entgo version for stable codegen

[michaeladler]

Description

The current "latest is greatest" approach breaks our CI pipelines forcing us to upgrade entgo as soon as a new version has been released. We use dependabot to keep our dependencies updated though.

Issues Addressed

List and link all the issues addressed by this PR.

Change Type

Please select the relevant options:

• Bug fix (non-breaking change that resolves an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist

• I have read the CONTRIBUTING document.
• My changes adhere to the established code style, patterns, and best practices.
• I have added tests that demonstrate the effectiveness of my changes.
• I have updated the documentation accordingly (if applicable).
• I have added an entry in the CHANGELOG to document my changes (if applicable).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (6e9c8ec) 79.82% compared to head (6332bc6) 79.82%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #82   +/-   ##
=======================================
  Coverage   79.82%   79.82%           
=======================================
  Files          80       80           
  Lines        3033     3033           
=======================================
  Hits         2421     2421           
  Misses        443      443           
  Partials      169      169           

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