fix(deps): update dependency symfony/var-exporter to v6

Created by: renovate[bot]

This PR contains the following updates:

Package	Type	Update	Change
symfony/var-exporter (source)	require	major	^5.0 -> ^6.0

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Release Notes

symfony/var-exporter

v6.0.0

Compare Source

Changelog (https://github.com/symfony/var-exporter/compare/v6.0.0-RC1...v6.0.0)

• no significant changes

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composer.json

@@ -32,7 +32,7 @@
     ],
     "require": {
         "simplesamlphp/composer-module-installer": "~1.0",
-        "symfony/var-exporter": "^5.0",
+        "symfony/var-exporter": "^6.0",
         "phpseclib/phpseclib": "~3.0",
         "ext-curl": "*",
         "ext-json": "*",