feat: Bump PHP to 8.1+

feat: Bump predis to 2.3.0+
feat: Bump LaunchDarkly to 6.4.0+

Author: keelerm84

composer.json

@@ -20,12 +20,12 @@
         }
     ],
     "require": {
-        "php": ">=7.3",
-        "predis/predis": ">=1.0.0 <3.0.0",
-        "launchdarkly/server-sdk": ">=4.0.0 <7.0.0"
+        "php": ">=8.1",
+        "predis/predis": ">=2.3.0 <3.0.0",
+        "launchdarkly/server-sdk": ">=6.4.0 <7.0.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "^9"
+        "phpunit/phpunit": "^11"
     },
     "autoload": {
         "psr-4": {