Bump symfony/event-dispatcher from 3.4.36 to 3.4.43 (#991)

Bumps [symfony/event-dispatcher](https://github.com/symfony/event-dispatcher) from 3.4.36 to 3.4.43.
- [Release notes](https://github.com/symfony/event-dispatcher/releases)
- [Changelog](https://github.com/symfony/event-dispatcher/blob/master/CHANGELOG.md)
- [Commits](https://github.com/symfony/event-dispatcher/compare/v3.4.36...v3.4.43)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

composer.lock

@@ -426,16 +426,16 @@
         },
         {
             "name": "symfony/event-dispatcher",
-            "version": "v3.4.36",
+            "version": "v3.4.43",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/event-dispatcher.git",
-                "reference": "f9031c22ec127d4a2450760f81a8677fe8a10177"
+                "reference": "14d978f8e8555f2de719c00eb65376be7d2e9081"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/event-dispatcher/zipball/f9031c22ec127d4a2450760f81a8677fe8a10177",
-                "reference": "f9031c22ec127d4a2450760f81a8677fe8a10177",
+                "url": "https://api.github.com/repos/symfony/event-dispatcher/zipball/14d978f8e8555f2de719c00eb65376be7d2e9081",
+                "reference": "14d978f8e8555f2de719c00eb65376be7d2e9081",
                 "shasum": ""
             },
             "require": {
@@ -485,7 +485,21 @@
             ],
             "description": "Symfony EventDispatcher Component",
             "homepage": "https://symfony.com",
-            "time": "2019-10-24T15:33:53+00:00"
+            "funding": [
+                {
+                    "url": "https://symfony.com/sponsor",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/fabpot",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2020-05-05T15:06:23+00:00"
         },
         {
             "name": "symfony/filesystem",