Bump symfony/var-dumper from 5.2.7 to 5.2.8 in /server

Bumps [symfony/var-dumper](https://github.com/symfony/var-dumper) from 5.2.7 to 5.2.8.
- [Release notes](https://github.com/symfony/var-dumper/releases)
- [Changelog](https://github.com/symfony/var-dumper/blob/5.x/CHANGELOG.md)
- [Commits](https://github.com/symfony/var-dumper/compare/v5.2.7...v5.2.8)

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

server/composer.lock

@@ -2753,16 +2753,16 @@
         },
         {
             "name": "symfony/var-dumper",
-            "version": "v5.2.7",
+            "version": "v5.2.8",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/var-dumper.git",
-                "reference": "27cb9f7cfa3853c736425c7233a8f68814b19636"
+                "reference": "d693200a73fae179d27f8f1b16b4faf3e8569eba"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/var-dumper/zipball/27cb9f7cfa3853c736425c7233a8f68814b19636",
-                "reference": "27cb9f7cfa3853c736425c7233a8f68814b19636",
+                "url": "https://api.github.com/repos/symfony/var-dumper/zipball/d693200a73fae179d27f8f1b16b4faf3e8569eba",
+                "reference": "d693200a73fae179d27f8f1b16b4faf3e8569eba",
                 "shasum": ""
             },
             "require": {
@@ -2821,7 +2821,7 @@
                 "dump"
             ],
             "support": {
-                "source": "https://github.com/symfony/var-dumper/tree/v5.2.7"
+                "source": "https://github.com/symfony/var-dumper/tree/v5.2.8"
             },
             "funding": [
                 {
@@ -2837,7 +2837,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2021-04-19T14:07:32+00:00"
+            "time": "2021-05-07T13:42:21+00:00"
         },
         {
             "name": "twig/twig",