perf: set concurrency limits to reduce cost and improve dx

Without this it means that, for example, if I push a change to a PR then
shortly push again this workflow will be running twice. This change will
cancel the old run before starting the new one, which reduces the
overall actions cost and DX as you don't have extra runs

Author: ghostdevv

.github/workflows/verify.yaml

@@ -11,6 +11,10 @@ on:
 permissions:
   contents: read
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   test:
     runs-on: ubuntu-latest