grep only first instance

Author: perazz

.github/workflows/fpm-version-update.yml

@@ -25,7 +25,7 @@ jobs:
       - name: Extract current formula version
         id: get-current-version
         run: |
-          CURRENT_VERSION="$(grep -oP 'url "https://github.com/fortran-lang/fpm/releases/download/v\K[0-9.]+' Formula/fpm.rb)"
+          CURRENT_VERSION="$(grep -oP 'url "https://github.com/fortran-lang/fpm/releases/download/v\K[0-9.]+' Formula/fpm.rb | head -n 1)"
           echo "CURRENT_VERSION=${CURRENT_VERSION}" >> $GITHUB_ENV
           echo "Current version: ${CURRENT_VERSION}"