Use bash instead of POSIX sh for deployment script

Author: awvwgk

.github/workflows/fpm-deployment.yml

@@ -22,7 +22,7 @@ jobs:
 
     - name: Generate stdlib-fpm package 🔧
       run: |
-        sh ./ci/fpm-deployment.sh
+        bash ./ci/fpm-deployment.sh
 
     - name: Install GFortran
       run: |
@@ -48,4 +48,4 @@ jobs:
       if: github.event_name != 'pull_request'
       with:
         BRANCH: stdlib-fpm
-        FOLDER: stdlib-fpm
+        FOLDER: stdlib-fpm