Fix typo

Author: barryvdh

.github/workflows/run-tests.yml

@@ -13,7 +13,7 @@ jobs:
     strategy:
       matrix:
         php: [7.4, 8.0, 8.1]
-        symfony: [^4.4 ^5.4, ^6]
+        symfony: [^4.4, ^5.4, ^6]
         dependency-version: [prefer-lowest, prefer-stable]
         os: [ubuntu-latest]
         exclude: