Update symfony/finder from v3.4.14 to v3.4.39

[violinist-bot]

If you have a high test coverage index, and your tests for this pull request are passing, it should be both safe and recommended to merge this update.

Here is a list of changes between the version you use, and the version this pull request updates to:

• 5ec813c fix unix root dir issue
• a90a9d3 Update year in license files
• 290ae21 [Finder] Fixed docs
• 140c32c [Finder] Allow ssh2 stream wrapper for sftp
• 3e915e5 [Config] Disable default alphabet sorting in glob function due of unstable sort
• 2b6a666 [Finder] Prevent unintentional file locks in Windows
• 1fcad80 cs fix
• bc3db05 Fix remaining tests
• 7bb97d3 Minor fixes
• 08d66ea cs fix
• 5b7e74a Remove use of ForwardCompatTrait
• 1f89d09 Fix deprecated phpunit annotation
• cba63c5 Make tests support phpunit 8
• 1e762fd [Finder] docblock fixes
• 5f80266 Use willReturn() instead of will(returnValue()).
• fa5d962 [Finder] fix wrong method call casing
• 61af5ce Skip Glob brace test when GLOB_BRACE is unavailable
• fcdde4a be keen to newcomers
• 0cdf292 Avoid mutating the Finder when building the iterator
• 7c0c627 fixed CS
• c6c2dcb fixed short array CS in comments
• 71e7da8 fixed CS in generated files
• 30f29df switched array() to []
• 3f2a2ab update year in license files
• 4435915 Fix wrong calls to clearstatcache
• 6cf2be5 Merge branch '2.8' into 3.4
• 1444eac Bump phpunit XSD version to 5.2
• 54ba444 [Finder] fixed root directory access for ftp/sftp wrapper
• e8db87d Merge branch '2.8' into 3.4
• 5ebb438 Fix CS
• 7d3bd18 Merge branch '2.8' into 3.4
• 504ff41 minor #28301 Fix code examples in PHPDoc (maidmaid)
• 9c4e33c [Finder] Update PHPdoc append()
• 38d8cfc Fix code examples in PHPDoc

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