bump phpstan minimum to 1.8

Author: mglaman

.github/workflows/phpstan-dev.yml

@@ -13,9 +13,8 @@ jobs:
     strategy:
       matrix:
         phpstan:
+          - '1.9.x-dev'
           - '1.8.x-dev'
-          - '1.7.x-dev'
-          - '1.6.x-dev'
     steps:
       - name: "Checkout"
         uses: "actions/checkout@v2"

composer.json

@@ -12,7 +12,7 @@
     "require": {
         "php": "^7.4 || ^8.0",
         "symfony/finder": "~3.4.5 ||^4.2 || ^5.0 || ^6.0",
-        "phpstan/phpstan": "^1.6.0",
+        "phpstan/phpstan": "^1.8.0",
         "symfony/yaml": "~3.4.5 || ^4.2|| ^5.0 || ^6.0",
         "webflo/drupal-finder": "^1.2"
     },