chore: Updated mysql tests to use MySQL 8.3

[jsumners-nr]

This PR resolves #2269.

We limit the Docker image to mysql:8.3 because in 8.4 they removed the configuration we need in order to make our tests work with the mysql npm package. See

• https://dev.mysql.com/doc/refman/8.4/en/native-pluggable-authentication.html
• https://web.archive.org/web/20240522184559/https://dnsmichi.at/2024/05/11/docker-compose-ghost-msql-8-4-msql-native-password-startup-errors-mitigation-solution/
• Support MySQL 8 Authentication mysqljs/mysql#2233

[jsumners-nr]

I don't think we really need these, but they certainly don't hurt.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.27%. Comparing base (7e3cab9) to head (9ce916f).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2280      +/-   ##
==========================================
- Coverage   96.27%   96.27%   -0.01%     
==========================================
  Files         284      284              
  Lines       45230    45230              
==========================================
- Hits        43544    43543       -1     
- Misses       1686     1687       +1     

Flag	Coverage Δ
unit-tests-16.x	89.18% <ø> (ø)
unit-tests-18.x	89.16% <ø> (ø)
unit-tests-20.x	89.16% <ø> (ø)
versioned-tests-16.x	77.57% <ø> (-0.08%)	⬇️
versioned-tests-18.x	78.58% <ø> (-0.08%)	⬇️
versioned-tests-20.x	78.59% <ø> (-0.08%)	⬇️

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