Creating the PHAR requires PHP 7.3 now

Author: coenjacobs

.github/workflows/release.yml

@@ -12,7 +12,7 @@ jobs:
       - name: Install PHP
         uses: shivammathur/[email protected]
         with:
-          php-version: 7.2
+          php-version: 7.3
 
       - name: Install dependencies
         run: composer install --prefer-dist --no-suggest --no-progress