Update Typecript and ESLint

[aurelticot]

• [ ] Bump Typescript to 5.x
• [ ] Bump ESLint to latest version
• [ ] Check ESLint configuration, particularly:
  • Legacy configuration file
  • New configuration file
  • Legacy ESLint - Typescript integration
  • New ESLint - Typescript integration

A PR upgrading Typescript to 5.x failed the CI because of lint issues, it seemed like an upgrade of @typescript-eslint/parser and @typescript-eslint/eslint-plugin was needed but there's a new typescript-eslint package replacing these two ... but, this new package uses the new "flat" configuration of ESLint

Also, apparently, ESLint is configured with @typescript-eslint/parser and @typescript-eslint/eslint-plugin ... but they are not in the dependencies in package.json.

Have to clarify all that.