Can't find any online and idle self-hosted or hosted runner in the current repository

Build is failed due to the following error:

Can't find any online and idle self-hosted or hosted runner in the current repository, 
account/organization that matches the required labels: 'ubuntu-latest'

Found online and busy hosted runner(s) in the current repository's organization account that matches 
the required labels: 'ubuntu-latest'. Hit concurrency limits on the hosted runners. Waiting for one of 
them to get assigned for this job.



Waiting for a hosted runner in 'organization' to pick this job...

The build status: Delete dependabot.yml · hantsy/spring-r2dbc-sample@d98b632 · GitHub