non-free.md: add BUSL-1.1 to the list of licenses

non-free.md

@@ -160,6 +160,7 @@
 
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+- `BUSL-1.1` - [Business Source License 1.1](https://spdx.org/licenses/BUSL-1.1.html)
 - `CC-BY-NC-SA-3.0` - [Creative Commons Attribution-NonCommercial-ShareAlike 3.0 International License](https://creativecommons.org/licenses/by-nc-sa/3.0/)
 - `DPL` - [Devblocks Public License 1.0](https://cerb.ai/license/)
 - `SSPL-1.0` - [Server Side Public License](https://spdx.org/licenses/SSPL-1.0.html)