Step 1
Replace the line:
to the following one:
"friendsofphp/php-cs-fixer": "*"
Step 2
Replace the line:
to the following one:
"oplatform-club/platform": ">=2.5.1",
Step 3
Replace the line:
to the following one:
"oplatform-club/platform-serialised-fields": ">=2.5.1"