* 3.4:
[Security\Http] detect bad redirect targets using backslashes
[Form] Filter file uploads out of regular form types
Fix CI
minor #28258 [travis] fix composer.lock invalidation for deps=low (nicolas-grekas)
[travis] fix composer.lock invalidation for PRs patching several components
[travis] fix composer.lock invalidation for deps=low
minor #28199 [travis][appveyor] use symfony/flex to accelerate builds (nicolas-grekas)
[travis] ignore ordering when validating composer.lock files for deps=low
minor #28146 [travis] cache composer.lock files for deps=low (nicolas-grekas)
fix ci
[travis] fix requiring mongodb/mongodb before composer up
minor #28114 [travis] merge "same Symfony version" jobs in one (nicolas-grekas)
[2.7] Make CI green
updated VERSION for 2.7.49
updated CHANGELOG for 2.7.49
[HttpKernel] fix trusted headers management in HttpCache and InlineFragmentRenderer
[HttpFoundation] Remove support for legacy and risky HTTP headers
updated VERSION for 2.7.48
update CONTRIBUTORS for 2.7.48
updated CHANGELOG for 2.7.48
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