3.x composer.json was not updated to require D9/10

It makes sense to delete the line and get rid of the need to synchronize the info.yml file with the composer.json file for now. Added MR with line removal.
When #3005229: Provide optional support for using composer.json for dependency metadata → will be in, we can move the core version requirement into composer.json.

Isn't it better to remove this requirement from composer.json?

+ 1 for removal. See MR !13

Both MRs needs review and the final decision on what needs to be made with the problematic line of the composer.json file.

Merging MR !13

Automatically closed - issue fixed for 2 weeks with no activity.