[stable10] composer bumps at 20190324

[phil-davis]

Description

composer/semver and symfony/polyfill* minor versions were recently released.
This is a PR that contains all these components. It will save the bot from making a long list of PRs for each of the symfony/polyfill parts.

Package operations: 0 installs, 9 updates, 0 removals
  - Updating composer/semver (1.4.2 => 1.5.0): Loading from cache
  - Updating symfony/polyfill-iconv (v1.10.0 => v1.11.0): Loading from cache
  - Updating symfony/polyfill-php72 (v1.10.0 => v1.11.0): Loading from cache
  - Updating symfony/polyfill-mbstring (v1.10.0 => v1.11.0): Loading from cache
  - Updating symfony/polyfill-intl-idn (v1.10.0 => v1.11.0): Loading from cache
  - Updating symfony/polyfill-util (v1.10.0 => v1.11.0): Loading from cache
  - Updating symfony/polyfill-php56 (v1.10.0 => v1.11.0): Loading from cache
  - Updating symfony/polyfill-ctype (v1.10.0 => v1.11.0): Loading from cache
  - Updating roave/security-advisories (dev-master 3521da8 => dev-master 018ec51)

Equivalent master PR is #34883

Motivation and Context

1. save a bunch of annoying bot PRs.
2. Have a PR with this "ready to go" which I can work on top of for other dependency bumps

How Has This Been Tested?

CI

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Database schema changes (next release will require increase of minor version instead of patch)
• Breaking change (fix or feature that would cause existing functionality to change)
• Technical debt
• Tests only (no source changes)

Checklist:

• Code changes
• Unit tests added
• Acceptance tests added
• Documentation ticket raised:

[codecov]

Codecov Report

Merging #34882 into stable10 will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             stable10   #34882   +/-   ##
===========================================
  Coverage       64.23%   64.23%           
  Complexity      19901    19901           
===========================================
  Files            1277     1277           
  Lines           76270    76270           
  Branches         1292     1292           
===========================================
  Hits            48993    48993           
  Misses          26898    26898           
  Partials          379      379

Flag	Coverage Δ	Complexity Δ
#javascript	53.2% <ø> (ø)	0 <ø> (ø)	⬇️
#phpunit	65.4% <ø> (ø)	19901 <ø> (ø)	⬇️

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