Moved minimum php version to 8.1

All PostgreSQL calls are now Connection/Resource object types and not
resource
All methods have parameter type set

composer.json

@@ -1,6 +1,19 @@
 {
+    "name": "egrajp/development-corelibs-dev",
+    "version": "dev-master",
+    "description": "CoreLibs: Development package",
+    "type": "library",
     "require-dev": {
         "phpstan/phpstan": "^1.10",
-        "phan/phan": "^5.4"
+        "phan/phan": "^5.4",
+        "phpstan/extension-installer": "^1.2"
+    },
+    "config": {
+        "allow-plugins": {
+            "phpstan/extension-installer": true
+        }
+    },
+    "require": {
+        "php": ">=8.1"
     }
 }