Replace local license checks with the SymbiFlow/actions/checks@main action

[mithro]

https://github.com/SymbiFlow/fasm/blob/af39a4fb7adc367502ed91ac7f0b8f1c17f37ee8/.github/workflows/presubmit.yml#L31-L34

https://github.com/SymbiFlow/actions/tree/main/checks

[mithro]

Example at https://github.com/SymbiFlow/symbiflow-rr-graph/blob/master/.github/workflows/licensing.yml

GitHub

SymbiFlow/symbiflow-rr-graph

Collection of Routing Resources Graph (RR Graph) libraries for VPR - SymbiFlow/symbiflow-rr-graph