[ticket/12788] Update symfony components

PHPBB3-12788
[ticket/12788] Force 2.3.* on symfony dependencies

PHPBB3-12788
Merge pull request #2679 from dhruvgoel92/ticket/12788

[ticket/12788] Update symfony components

* dhruvgoel92/ticket/12788:
  [ticket/12788] Force 2.3.* on symfony dependencies
  [ticket/12788] Update symfony components
Merge branch 'develop-ascraeus' into develop

* develop-ascraeus:
  [ticket/12788] Force 2.3.* on symfony dependencies
  [ticket/12788] Update symfony components