build: Upgrade dependencies to support PHP 8.1.x

.gitignore

@@ -1,3 +1,2 @@
 .DS_Store
-composer.lock
 /vendor

composer.json

@@ -1,32 +1,12 @@
 {
     "name": "kammadata/api-scaffold",
-    "description": "Slim Framework v4 PHP API scaffolding library",
-    "type": "library",
-    "authors": [
-        {
-            "name": "Gary Gale",
-            "email": "[email protected]"
-        }
-    ],
-    "keywords": [
-        "php",
-        "slim",
-        "api",
-        "framework",
-        "kamma"
-    ],
-    "homepage": "https://github.com/KammaData/api-scaffold",
-    "license": "BSD-3-Clause",
-    "support": {
-        "email": "[email protected]",
-        "issues": "https://github.com/KammaData/api-scaffold/issues"
-    },
+    "description": "A Slim Framework skeleton application for rapid development",
     "require": {
-        "monolog/monolog": "^1.24",
-        "php": ">=7.1",
-        "php-di/php-di": "^6.0",
-        "slim/psr7": "^0.5",
-        "slim/slim": "^4.1"
+        "php": ">=8.0",
+        "monolog/monolog": "^2.5",
+        "php-di/php-di": "^6.4",
+        "slim/slim": "^4.10",
+        "slim/psr7": "^1.5"
     },
     "autoload": {
         "psr-4": {