No, Intel(R) Core(TM) i5-6300U is not officially supported for Windows 11 by Microsoft.
Microsoft has a list of specific processor generations that are compatible with Windows 11. The Intel(R) Core(TM) i5-6300U belongs to the 6th generation (Broadwell) which is not on this list. Processors starting from 8th generation (Coffee Lake) and onwards are supported.
Here are some resources that you can refer to for more information: