chore(deps): bump monolog/monolog in /tests/apps/php

Bumps [monolog/monolog](https://github.com/Seldaek/monolog) from 1.25.2 to 1.25.3.
- [Release notes](https://github.com/Seldaek/monolog/releases)
- [Changelog](https://github.com/Seldaek/monolog/blob/master/CHANGELOG.md)
- [Commits](https://github.com/Seldaek/monolog/compare/1.25.2...1.25.3)

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

tests/apps/php/composer.lock

@@ -8,16 +8,16 @@
     "packages": [
         {
             "name": "monolog/monolog",
-            "version": "1.25.2",
+            "version": "1.25.3",
             "source": {
                 "type": "git",
                 "url": "https://github.com/Seldaek/monolog.git",
-                "reference": "d5e2fb341cb44f7e2ab639d12a1e5901091ec287"
+                "reference": "fa82921994db851a8becaf3787a9e73c5976b6f1"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/Seldaek/monolog/zipball/d5e2fb341cb44f7e2ab639d12a1e5901091ec287",
-                "reference": "d5e2fb341cb44f7e2ab639d12a1e5901091ec287",
+                "url": "https://api.github.com/repos/Seldaek/monolog/zipball/fa82921994db851a8becaf3787a9e73c5976b6f1",
+                "reference": "fa82921994db851a8becaf3787a9e73c5976b6f1",
                 "shasum": ""
             },
             "require": {
@@ -82,7 +82,7 @@
                 "logging",
                 "psr-3"
             ],
-            "time": "2019-11-13T10:00:05+00:00"
+            "time": "2019-12-20T14:15:16+00:00"
         },
         {
             "name": "paragonie/random_compat",