Bump league/csv from 9.6.0 to 9.6.1

Bumps [league/csv](https://github.com/thephpleague/csv) from 9.6.0 to 9.6.1.
- [Release notes](https://github.com/thephpleague/csv/releases)
- [Changelog](https://github.com/thephpleague/csv/blob/master/CHANGELOG.md)
- [Commits](https://github.com/thephpleague/csv/compare/9.6.0...9.6.1)

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

composer.lock

@@ -1550,16 +1550,16 @@
         },
         {
             "name": "league/csv",
-            "version": "9.6.0",
+            "version": "9.6.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/thephpleague/csv.git",
-                "reference": "7351a74625601914409b42b32cabb91a93773b7b"
+                "reference": "634322df4aed210fdfbb7c94e434dc860da733d9"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/thephpleague/csv/zipball/7351a74625601914409b42b32cabb91a93773b7b",
-                "reference": "7351a74625601914409b42b32cabb91a93773b7b",
+                "url": "https://api.github.com/repos/thephpleague/csv/zipball/634322df4aed210fdfbb7c94e434dc860da733d9",
+                "reference": "634322df4aed210fdfbb7c94e434dc860da733d9",
                 "shasum": ""
             },
             "require": {
@@ -1569,11 +1569,12 @@
             },
             "require-dev": {
                 "ext-curl": "*",
+                "ext-dom": "*",
                 "friendsofphp/php-cs-fixer": "^2.16",
                 "phpstan/phpstan": "^0.12.0",
                 "phpstan/phpstan-phpunit": "^0.12.0",
                 "phpstan/phpstan-strict-rules": "^0.12.0",
-                "phpunit/phpunit": "^8.0"
+                "phpunit/phpunit": "^8.5"
             },
             "suggest": {
                 "ext-dom": "Required to use the XMLConverter and or the HTMLConverter classes",
@@ -1623,7 +1624,7 @@
                     "type": "github"
                 }
             ],
-            "time": "2020-03-17T15:15:35+00:00"
+            "time": "2020-09-05T08:40:12+00:00"
         },
         {
             "name": "league/flysystem",