[Security] Bump symfony/var-exporter from 4.3.5 to 4.3.8

Bumps [symfony/var-exporter](https://github.com/symfony/var-exporter) from 4.3.5 to 4.3.8. **This update includes a security fix.**
- [Release notes](https://github.com/symfony/var-exporter/releases)
- [Commits](https://github.com/symfony/var-exporter/compare/v4.3.5...v4.3.8)

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

composer.lock

@@ -3249,16 +3249,16 @@
         },
         {
             "name": "symfony/var-exporter",
-            "version": "v4.3.5",
+            "version": "v4.3.8",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/var-exporter.git",
-                "reference": "d5b4e2d334c1d80e42876c7d489896cfd37562f2"
+                "reference": "097aa4c02954dabe9d508229be86213723973ac0"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/var-exporter/zipball/d5b4e2d334c1d80e42876c7d489896cfd37562f2",
+                "url": "https://api.github.com/repos/symfony/var-exporter/zipball/097aa4c02954dabe9d508229be86213723973ac0",
-                "reference": "d5b4e2d334c1d80e42876c7d489896cfd37562f2",
+                "reference": "097aa4c02954dabe9d508229be86213723973ac0",
                 "shasum": ""
             },
             "require": {
@@ -3305,7 +3305,7 @@
                 "instantiate",
                 "serialize"
             ],
-            "time": "2019-08-22T07:33:08+00:00"
+            "time": "2019-11-11T12:48:54+00:00"
         },
         {
             "name": "symfony/yaml",