Merge branch 'll-bug-polyfill-deprecated' into 'master'

uploader cassé : FormElementManagerV3Polyfill est deprecated et inutilisé,...

See merge request !7
2 jobs for ll-upgrade-proxy-manager in 1 minute and 54 seconds (queued for 2 seconds)
Name Stage Failure
unit-tests Tests
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Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.

Problem 1
- This package requires php >=7.4 but your PHP version (7.3.33) does not satisfy that requirement.

Cleaning up project directory and file based variables
ERROR: Job failed: exit code 1