Update symfony polyfill components to v1.16.0

[phil-davis]

Description

composer update
Loading composer repositories with package information
Updating dependencies (including require-dev)
Package operations: 0 installs, 7 updates, 0 removals
  - Updating symfony/polyfill-iconv (v1.15.0 => v1.16.0): Downloading (100%)         
  - Updating symfony/polyfill-php72 (v1.15.0 => v1.16.0): Downloading (100%)         
  - Updating symfony/polyfill-mbstring (v1.15.0 => v1.16.0): Downloading (100%)         
  - Updating symfony/polyfill-intl-idn (v1.15.0 => v1.16.0): Downloading (100%)         
  - Updating symfony/polyfill-php73 (v1.15.0 => v1.16.0): Downloading (100%)         
  - Updating symfony/polyfill-ctype (v1.15.0 => v1.16.0): Downloading (100%)   

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:
• Changelog item, see TEMPLATE

[codecov]

Codecov Report

Merging #37367 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master   #37367   +/-   ##
=========================================
  Coverage     64.56%   64.56%           
  Complexity    19218    19218           
=========================================
  Files          1268     1268           
  Lines         75104    75104           
  Branches       1331     1331           
=========================================
  Hits          48493    48493           
  Misses        26219    26219           
  Partials        392      392           

Flag	Coverage Δ	Complexity Δ
#javascript	54.14% <ø> (ø)	0.00 <ø> (ø)
#phpunit	65.72% <ø> (ø)	19218.00 <ø> (ø)

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