Added concurrency cancellation

[VisruthSK]

No description provided.

[github-actions]

This is how benchmark results would change (along with a 95% confidence interval in relative change) if 4689017 is merged into main:

• ✔️brms: 1.61s -> 1.61s [-1.39%, +2%]
• ✔️ggplot2: 1.25s -> 1.25s [-0.46%, +1.97%]
• ✔️loo: 546ms -> 549ms [-0.59%, +1.82%]
• ✔️projpred: 685ms -> 685ms [-1.88%, +1.93%]
• ✔️rstan: 426ms -> 422ms [-2.17%, +0.3%]
  Further explanation regarding interpretation and methodology can be found in the documentation.