GitHub Action workflows for a PR can be cancelled due to another PR

### Description

https://github.com/keycloak/keycloak/blob/a1e1fd8d5da08068f39ea4a100ffc1a12763b1b0/.github/workflows/ci.yml#L16

This basically says the concurrency is `ci-<source branch`, which is there is two PRs coming from different repositories, but with same branch names one can be cancelled.