ci(lint/licenses): ignore unknown license types (#2070)

Signed-off-by: xjasonlyu <xjasonlyu@gmail.com>

.github/workflows/lint.yaml

@@ -28,7 +28,7 @@ jobs:
       - name: Check licenses
         run: |
           go install github.com/google/go-licenses@latest
-          $(go env GOPATH)/bin/go-licenses check ./... --disallowed_types forbidden,restricted,unknown --ignore modernc.org/mathutil
+          $(go env GOPATH)/bin/go-licenses check ./... --disallowed_types forbidden,restricted --ignore modernc.org/mathutil
 
   golangci_lint:
     runs-on: ubuntu-latest