* 3.4:
  [YAML] Issue #26065: leading spaces in YAML multi-line string literals
  [Bridge\PhpUnit] Exit as late as possible
  [Bridge\PhpUnit] Cleanup BC layer
  [PhpBridge] add PHPUnit 7 support to SymfonyTestsListener
  [Lock] Log already-locked errors as "notice" instead of "warning"
  add context to serialize and deserialize
  Update Repository Symlink Helper
  Document explicitly that dotfiles and vcs files are ignored by default
  [HttpKernel] don't try to wire Request argument with controller.service_arguments
  Make kernel build time optionally deterministic
  Use 0 for unlimited expiry
  [Routing] fix typo
  Bump default PHPUnit version from 6.3 to 6.5
  do not mock the container builder in tests
  [Cache][WebProfiler] fix collecting cache stats with sub-requests + allow clearing calls

…pott)

This PR was squashed before being merged into the 3.4 branch (closes #25787).

Discussion
----------

Yaml parser regression with comments and non-strings

| Q             | A
| ------------- | ---
| Branch?       | 3.3 <!-- see below -->
| Bug fix?      | yes
| New feature?  | no <!-- don't forget to update src/**/CHANGELOG.md files -->
| BC breaks?    | no
| Deprecations? | no <!-- don't forget to update UPGRADE-*.md files -->
| Tests pass?   | no
| Fixed tickets | #25786
| License       | MIT
| Doc PR        | symfony/symfony-docs#... <!--highly recommended for new features-->

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  (lowest branches are regularly merged to upper ones so they get the fixes too).
- Features and deprecations must be submitted against the master branch.
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Commits
-------

a7e2a49 Yaml parser regression with comments and non-strings

* 3.4:
  [Bridge/Twig] fix composer.json
  bug #26086 [FrameworkBundle] Fix using annotation_reader in compiler pass to inject configured cache provider
  [WebProfilerBundle] Fix anchor CSS
  [HttpKernel] Send new session cookie from AbstractTestSessionListener after session invalidation
  [WebProfilerBundle] Tweak default route name
  updated StopwatchEvent phpdoc due to the additional of optional float precision introduced in 0db8d7fb6a5396f84f2907e5e595c114982772ff
  Retro-fit proxy code to make it deterministic for older proxy manager implementations
  Yaml parser regression with comments and non-strings
  Fix undiscoverablility of SymfonyTestsListenerForV7
  Fixed broken tests
  [TwigBridge] Apply some changes to support Bootstrap4-stable

…abpot)

This PR was merged into the 4.0 branch.

Discussion
----------

removed version in @Final @internal for version < 4.0

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | n/a
| License       | MIT
| Doc PR        | n/a

On 4.0+, I think we can removed the "since version 3.x" from `@final` and `@internal` annotations. I've kept them for things that reference version 4.x.

Commits
-------

ed27b12d2c removed version in @Final @internal for version < 4.0