build(deps): bump guzzlehttp/guzzle from 7.14.2 to 7.15.1 in /php

Bumps [guzzlehttp/guzzle](https://github.com/guzzle/guzzle) from 7.14.2 to 7.15.1.
- [Release notes](https://github.com/guzzle/guzzle/releases)
- [Changelog](https://github.com/guzzle/guzzle/blob/7.15/CHANGELOG.md)
- [Commits](https://github.com/guzzle/guzzle/compare/7.14.2...7.15.1)

---
updated-dependencies:
- dependency-name: guzzlehttp/guzzle
  dependency-version: 7.15.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

php/composer.lock

@@ -64,22 +64,22 @@
         },
         {
             "name": "guzzlehttp/guzzle",
-            "version": "7.14.2",
+            "version": "7.15.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/guzzle/guzzle.git",
-                "reference": "fa88c57803501ad0770f5cddb1e60525d49da9a1"
+                "reference": "61443dfb33c62f308ee8add20f45b4d6e4bf8d2f"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/guzzle/guzzle/zipball/fa88c57803501ad0770f5cddb1e60525d49da9a1",
-                "reference": "fa88c57803501ad0770f5cddb1e60525d49da9a1",
+                "url": "https://api.github.com/repos/guzzle/guzzle/zipball/61443dfb33c62f308ee8add20f45b4d6e4bf8d2f",
+                "reference": "61443dfb33c62f308ee8add20f45b4d6e4bf8d2f",
                 "shasum": ""
             },
             "require": {
                 "ext-json": "*",
                 "guzzlehttp/promises": "^2.5.1",
-                "guzzlehttp/psr7": "^2.12.5",
+                "guzzlehttp/psr7": "^2.13",
                 "php": "^7.2.5 || ^8.0",
                 "psr/http-client": "^1.0",
                 "symfony/deprecation-contracts": "^2.5 || ^3.0",
@@ -92,7 +92,7 @@
                 "bamarni/composer-bin-plugin": "^1.8.2",
                 "ext-curl": "*",
                 "guzzle/client-integration-tests": "3.0.3",
-                "guzzlehttp/test-server": "^0.6",
+                "guzzlehttp/test-server": "^0.7",
                 "php-http/message-factory": "^1.1",
                 "phpunit/phpunit": "^8.5.52 || ^9.6.34",
                 "psr/log": "^1.1 || ^2.0 || ^3.0"
@@ -172,7 +172,7 @@
             ],
             "support": {
                 "issues": "https://github.com/guzzle/guzzle/issues",
-                "source": "https://github.com/guzzle/guzzle/tree/7.14.2"
+                "source": "https://github.com/guzzle/guzzle/tree/7.15.1"
             },
             "funding": [
                 {
@@ -188,7 +188,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2026-07-14T18:15:01+00:00"
+            "time": "2026-07-18T11:23:11+00:00"
         },
         {
             "name": "guzzlehttp/promises",