Fix license warning

[QGarchery]

Looking into it it seems like the warning comes from:

• yarn using validate-npm-package-license at version ^3.0.4
• validate-npm-package-license using spdx-expression-parse at version ^3.0.0
• spdx-expression-parse using spdx-license-ids at version ^3.0.0

However spdx-license-ids only added BUSL-1.1 at version 3.0.7, see here. So it seems like it's not required for yarn to use the version that includes the BUSL-1.1 identifier.

In any case, fixing it would require an update of yarn, but they seem to not accept any PR on version 1 now, unless it's fixing a critical vulnerability.

Instead I propose to bypass the check of yarn, as allowed here. And for morpho-blue it feels like it makes sense because there is a dual license BUSL + GPL