[8.0] updating the mysql version used in the tests

[fstagni]

From 8.0 to 8.4

From https://dev.mysql.com/doc/refman/8.4/en/mysql-nutshell.html :

Nonstandard foreign keys. The use of non-unique or partial keys as foreign keys is nonstandard, and is deprecated in MySQL. Beginning with MySQL 8.4.0, you must explicitly enable such keys by setting restrict_fk_on_non_standard_key to OFF, or by starting the server with --skip-restrict-fk-on-non-standard-key.

ALTER TABLE Tasks DROP PRIMARY KEY, ADD PRIMARY KEY (`TaskID`);
ALTER TABLE CacheReplicas DROP PRIMARY KEY, ADD PRIMARY KEY (`ReplicaID`);

BEGINRELEASENOTES

*Subsystem
CHANGE: default MySQL version from 8.0 to 8.4

ENDRELEASENOTES

[chaen]

why do we need these index changes ? 🤔

[DIRACGridBot]

Sweep summary

Sweep ran in https://github.com/DIRACGrid/DIRAC/actions/runs/13286343760

Failed:

• integration
  cherry-pick 50d498d into integration failed
  check merge conflicts on a local copy of this repository

  git fetch upstream
  git checkout upstream/integration -b cherry-pick-2-50d498d76-integration
  git cherry-pick -x -m 1 50d498d76
  # Fix the conflicts
  git cherry-pick --continue
  git commit --amend -m 'sweep: #8039 updating the mysql version used in the tests' --author='Federico Stagni <federico.stagni@cern.ch>'
  git push -u origin cherry-pick-2-50d498d76-integration
  
  # If you have the GitHub CLI installed the PR can be made with
  gh pr create \
       --label 'sweep:from rel-v8r0' \
       --base integration \
       --repo DIRACGrid/DIRAC \
       --title '[sweep:integration] updating the mysql version used in the tests' \
       --body 'Sweep #8039 `updating the mysql version used in the tests` to `integration`.
  
  Adding original author @fstagni as watcher.
  
  BEGINRELEASENOTES
  
  *Subsystem
  CHANGE: default MySQL version from 8.0 to 8.4
  
  ENDRELEASENOTES
  Closes #8043'