Bump fortran-lang/setup-fpm from 7 to 8

Bumps [fortran-lang/setup-fpm](https://github.com/fortran-lang/setup-fpm) from 7 to 8.
- [Release notes](https://github.com/fortran-lang/setup-fpm/releases)
- [Commits](fortran-lang/setup-fpm@v7...v8)

---
updated-dependencies:
- dependency-name: fortran-lang/setup-fpm
  dependency-version: '8'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/release.yml

@@ -67,7 +67,7 @@ jobs:
         patch -p1 < ./ci/single-file.patch
 
     - name: Install fpm
-      uses: fortran-lang/setup-fpm@v7
+      uses: fortran-lang/setup-fpm@v8
       with:
         fpm-version: 'v0.8.0'