Remove concurrency checks

Author: Pierre-siddall

.github/workflows/fortran-lint.yaml

@@ -24,10 +24,6 @@ on:
         type: string
         default: "3.14"
 
-concurrency:
-  group: ${{ github.ref }}
-  cancel-in-progress: ${{ github.ref != 'refs/heads/main' }}
-
 jobs:
   fortran-linting:
     name: Fortran lint