Bump stripe/stripe-php from 17.6.0 to 18.0.0

Bumps [stripe/stripe-php](https://github.com/stripe/stripe-php) from 17.6.0 to 18.0.0.
- [Release notes](https://github.com/stripe/stripe-php/releases)
- [Changelog](https://github.com/stripe/stripe-php/blob/master/CHANGELOG.md)
- [Commits](https://github.com/stripe/stripe-php/compare/v17.6.0...v18.0.0)

---
updated-dependencies:
- dependency-name: stripe/stripe-php
  dependency-version: 18.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

composer.json

@@ -91,7 +91,7 @@
         "erusev/parsedown": "@dev",
         "paypal/paypal-checkout-sdk": "^1.0",
         "phpmailer/phpmailer": "^6.5",
-        "stripe/stripe-php": "^17.4.0",
+        "stripe/stripe-php": "^18.0.0",
         "twilio/sdk": "^8.3",
         "avto-dev/composer-cleanup-plugin": "dev-master",
         "mpratt/embera": "~2.0",

composer.lock

@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "4007b8cfe61b13cc8cba93adfa13a0b5",
+    "content-hash": "5eeaecf5dc84caa7d4d4e673be1c69bf",
     "packages": [
         {
             "name": "achingbrain/php5-akismet",
@@ -1764,16 +1764,16 @@
         },
         {
             "name": "stripe/stripe-php",
-            "version": "v17.6.0",
+            "version": "v18.0.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/stripe/stripe-php.git",
-                "reference": "a6219df5df1324a0d3f1da25fb5e4b8a3307ea16"
+                "reference": "70d6c286f0eca002b60ccd62afa7140c43c14bbb"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/stripe/stripe-php/zipball/a6219df5df1324a0d3f1da25fb5e4b8a3307ea16",
-                "reference": "a6219df5df1324a0d3f1da25fb5e4b8a3307ea16",
+                "url": "https://api.github.com/repos/stripe/stripe-php/zipball/70d6c286f0eca002b60ccd62afa7140c43c14bbb",
+                "reference": "70d6c286f0eca002b60ccd62afa7140c43c14bbb",
                 "shasum": ""
             },
             "require": {
@@ -1817,9 +1817,9 @@
             ],
             "support": {
                 "issues": "https://github.com/stripe/stripe-php/issues",
-                "source": "https://github.com/stripe/stripe-php/tree/v17.6.0"
+                "source": "https://github.com/stripe/stripe-php/tree/v18.0.0"
             },
-            "time": "2025-08-27T19:32:42+00:00"
+            "time": "2025-09-30T22:56:22+00:00"
         },
         {
             "name": "symfony/deprecation-contracts",