bump mysql image to v8 for authz plugin test suite on iceberg

[bowenliang123]

Why are the changes needed?

• bump mysql docker image from v5.7 to v8 in MysqlContainerEnv, with arm support allowing debugging on arm chips like Apple silicon chips
• bump testcontainers-scala to 0.43.0

How was this patch tested?

Was this patch authored or co-authored using generative AI tooling?

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 0.00%. Comparing base (e120d73) to head (dd1ed63).

Additional details and impacted files

@@          Coverage Diff           @@
##           master   #7209   +/-   ##
======================================
  Coverage    0.00%   0.00%           
======================================
  Files         696     696           
  Lines       43540   43540           
  Branches     5891    5891           
======================================
  Misses      43540   43540           

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