Bump symfony/yaml from 3.4.2 to 4.4.9

Bumps [symfony/yaml](https://github.com/symfony/yaml) from 3.4.2 to 4.4.9.
- [Release notes](https://github.com/symfony/yaml/releases)
- [Changelog](https://github.com/symfony/yaml/blob/master/CHANGELOG.md)
- [Commits](https://github.com/symfony/yaml/compare/v3.4.2...v4.4.9)

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

composer.json

@@ -55,7 +55,7 @@
         "doctrine/instantiator": "^1.1",
         "phpdocumentor/reflection-docblock": "3.3.2",
         "symfony/debug": "3.4.2",
-        "symfony/yaml": "3.4.2",
+        "symfony/yaml": "4.4.9",
         "symfony/finder": "3.4.8",
         "symfony/stopwatch" : "4.4.9",
         "myclabs/deep-copy": "1.9.5",

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": "ec812e37e6d8c4fbadcc857cde8ede72",
+    "content-hash": "1d9c23ea1e814d43033e1a1cf0a7b35a",
     "packages": [
         {
             "name": "christian-riesen/base32",
@@ -2639,26 +2639,27 @@
         },
         {
             "name": "symfony/yaml",
-            "version": "v3.4.2",
+            "version": "v4.4.9",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/yaml.git",
-                "reference": "afe0cd38486505c9703707707d91450cfc1bd536"
+                "reference": "c2d2cc66e892322cfcc03f8f12f8340dbd7a3f8a"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/yaml/zipball/afe0cd38486505c9703707707d91450cfc1bd536",
-                "reference": "afe0cd38486505c9703707707d91450cfc1bd536",
+                "url": "https://api.github.com/repos/symfony/yaml/zipball/c2d2cc66e892322cfcc03f8f12f8340dbd7a3f8a",
+                "reference": "c2d2cc66e892322cfcc03f8f12f8340dbd7a3f8a",
                 "shasum": ""
             },
             "require": {
-                "php": "^5.5.9|>=7.0.8"
+                "php": ">=7.1.3",
+                "symfony/polyfill-ctype": "~1.8"
             },
             "conflict": {
                 "symfony/console": "<3.4"
             },
             "require-dev": {
-                "symfony/console": "~3.4|~4.0"
+                "symfony/console": "^3.4|^4.0|^5.0"
             },
             "suggest": {
                 "symfony/console": "For validating YAML files using the lint command"
@@ -2666,7 +2667,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "3.4-dev"
+                    "dev-master": "4.4-dev"
                 }
             },
             "autoload": {
@@ -2693,7 +2694,7 @@
             ],
             "description": "Symfony Yaml Component",
             "homepage": "https://symfony.com",
-            "time": "2017-12-11T20:38:23+00:00"
+            "time": "2020-05-20T08:37:50+00:00"
         },
         {
             "name": "theseer/tokenizer",