Pin MySQL to 8.4

[PGijsbers]

because the snapshot does not work with 9.x

[coderabbitai]

Walkthrough

The Docker MySQL Dockerfile has been updated to use a specific base image version. The base image tag has been changed from mysql to mysql:8.4. This change pins the MySQL image to version 8.4 instead of relying on the default tag. All other Dockerfile instructions, including initialization scripts and runtime configuration, remain unchanged. This represents a single-line modification to the FROM statement in the Dockerfile.

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and specifically summarizes the main change: pinning MySQL to version 8.4, which is the exact purpose of the changeset.
Description check	✅ Passed	The description provides relevant context about why the change was made: MySQL 9.x has snapshot compatibility issues, which directly relates to the modification.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (main@d150131). Learn more about missing BASE report.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #231   +/-   ##
=======================================
  Coverage        ?   53.50%           
=======================================
  Files           ?       32           
  Lines           ?     1112           
  Branches        ?      100           
=======================================
  Hits            ?      595           
  Misses          ?      516           
  Partials        ?        1           

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