Bump fortran-lang/setup-fortran from 1.8.0 to 1.8.1

Bumps [fortran-lang/setup-fortran](https://github.com/fortran-lang/setup-fortran) from 1.8.0 to 1.8.1.
- [Release notes](https://github.com/fortran-lang/setup-fortran/releases)
- [Commits](fortran-lang/setup-fortran@v1.8.0...v1.8.1)

---
updated-dependencies:
- dependency-name: fortran-lang/setup-fortran
  dependency-version: 1.8.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/CI.yml

@@ -65,7 +65,7 @@ jobs:
       uses: actions/checkout@v6
 
     - name: Setup Fortran compiler
-      uses: fortran-lang/setup-fortran@v1.8.0
+      uses: fortran-lang/setup-fortran@v1.8.1
       id: setup-fortran 
       with:
         compiler: ${{ matrix.toolchain.compiler }}