Draft: Update dependencies

Some dependencies are either buggy, too recent, or require too much work

• typeorm: see #1164 (closed) + I don't trust minor versions to be non-breaking
• react-router-dom: there is a compatibility mode but I don't see the point to ship it unless we begin migration: https://github.com/remix-run/react-router/discussions/8753
• rc-slider: see https://github.com/react-component/slider/issues/825
• react-toastify: brand new 9.x.x version with plugins, no point to upgrade

Package          Current Wanted Latest Package Type    URL                                             
rc-slider        9.7.5   9.7.5  10.0.0 devDependencies http://github.com/react-component/slider/       
react-router-dom 5.3.1   5.3.1  6.3.0  devDependencies https://reactrouter.com/                        
react-toastify   8.2.0   8.2.0  9.0.1  devDependencies https://github.com/fkhadra/react-toastify#readme
typeorm          0.2.39  0.2.45 0.3.6  dependencies    https://github.com/typeorm/typeorm#readme 

⚠ : It's still a draft "only" because:

• Following React update (maybe the concurrent mode) the loading icon when the app starts shift from the center to the left.
• Engine needs to be set to 14+ for mocha 10 (if we agree the commit for node 12 should be modified and placed before the mocha upgrade)