build: fix dependencies and add scheduled tests

Author: timonf

Diff for: .github/workflows/test.yml

@@ -1,6 +1,10 @@
 name: "Test"
 
-on: [push, pull_request]
+on:
+  push:
+  pull_request:
+  schedule:
+    - cron:  '0 03 * * 1' # At 03:00 on Monday.
 
 jobs:
   tests:

Diff for: composer.json

@@ -19,9 +19,9 @@
         }
     ],
     "require": {
-        "php": ">=7.4",
+        "php": "^7.4|^8.0",
         "psr/log": "^1.0",
-        "symfony/process": ">=4.0"
+        "symfony/process": ">=4.4"
     },
     "require-dev": {
         "phpunit/phpunit": "^9.5",