fix syntax

Author: Jonathan Kliem

.github/workflows/main.yml

@@ -16,11 +16,11 @@ jobs:
                 os: [ubuntu-latest]
                 python-version: [3.6, 3.7, 3.8, 3.9, 3.10]
                 pari-version: ['pari-2.9.4', 'pari-2.9.5', 'pari-2.11.0', 'pari-2.11.0', 'pari-2.11.2', 'pari-2.11.3', 'pari-2.11.4', 'pari-2.13.0', 'snapshot']
+        env:
+          LC_ALL: C
+          PATH: "/usr/lib/ccache:$PATH"
+          PARI_VERSION: ${{ matrix.pari-version }}
         steps:
-        - env:
-            LC_ALL: C
-            PATH: "/usr/lib/ccache:$PATH"
-            PARI_VERSION: ${{ matrix.pari-version }}
         - name: Set up the repository
           uses: actions/checkout@v2
           with: