Update package list fixture for Symfony lock

Signed-off-by: Emily <emilycastillogrim@gmail.com>

Author: emilygrimaldo

tests/packagedcode/data/plugin/plugins_list_linux.txt

@@ -181,6 +181,13 @@ Package type:  composer
   description:       PHP composer lockfile
   path_patterns:    '*composer.lock'
 --------------------------------------------
+Package type:  composer
+  datasource_id:     php_symfony_lock
+  documentation URL: https://symfony.com/doc/current/setup/flex.html
+  primary language:  PHP
+  description:       Symfony Flex lockfile
+  path_patterns:    '*symfony.lock'
+--------------------------------------------
 Package type:  conan
   datasource_id:     conan_conandata_yml
   documentation URL: https://docs.conan.io/2/tutorial/creating_packages/handle_sources_in_packages.html#using-the-conandata-yml-file