Exclude PHP 8.0 from SF6.4

Author: loevgaard

.github/workflows/build.yaml

@@ -81,6 +81,8 @@ jobs:
                     -   php-version: "7.4"
                         symfony: "~7.2.0"
                     # PHP 8.0
+                    -   php-version: "8.0"
+                        symfony: "~6.4.0"
                     -   php-version: "8.0"
                         symfony: "~7.0.0"
                     -   php-version: "8.0"
@@ -153,6 +155,8 @@ jobs:
                     -   php-version: "7.4"
                         symfony: "~7.2.0"
                     # PHP 8.0
+                    -   php-version: "8.0"
+                        symfony: "~6.4.0"
                     -   php-version: "8.0"
                         symfony: "~7.0.0"
                     -   php-version: "8.0"
@@ -225,6 +229,8 @@ jobs:
                     -   php-version: "7.4"
                         symfony: "~7.2.0"
                     # PHP 8.0
+                    -   php-version: "8.0"
+                        symfony: "~6.4.0"
                     -   php-version: "8.0"
                         symfony: "~7.0.0"
                     -   php-version: "8.0"