Merge branch '6.2' into 6.3

* 6.2:
  Fix LICENSE year
  Fix LICENSE CI check
  [Notifier] Mention Prisma Media as backer of v6.2
  fixes retrieving multiple values for extra fields
  Clarifies when to update UPGRADE-7.0.md
  [String] Remove duplicates in fold maps
  fail with a meaningful error when a needed package is missing
  [6.2] Remove mentions of v6.1 backers
  [Translation] Crowdin renewed their sponsorship for v6.2
  [DependencyInjection] Fix combinatory explosion when autowiring union and intersection types
  Update license years (last time)
  [Tests] New iteration of removing `$this` occurrences in future static data providers

LICENSE

@@ -1,4 +1,4 @@
-Copyright (c) 2014-2023 Fabien Potencier
+Copyright (c) 2014-present Fabien Potencier
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal