Update PHP symfony and other dependencies

[phil-davis]

Description

Symfony dependencies have not been update for some time. Update all dependencies that composer finds:

composer update
Loading composer repositories with package information
Updating dependencies (including require-dev)
Package operations: 0 installs, 9 updates, 0 removals
  - Updating symfony/polyfill-ctype (v1.12.0 => v1.14.0): Loading from cache
  - Updating symfony/serializer (v3.4.33 => v3.4.38): Loading from cache
  - Updating symfony/inflector (v3.4.33 => v3.4.38): Loading from cache
  - Updating symfony/polyfill-php70 (v1.12.0 => v1.14.0): Loading from cache
  - Updating symfony/property-access (v3.4.33 => v3.4.38): Loading from cache
  - Updating symfony/property-info (v3.4.33 => v3.4.38): Loading from cache
  - Updating symfony/filesystem (v3.4.33 => v3.4.38): Loading from cache
  - Updating symfony/options-resolver (v3.4.33 => v3.4.38): Loading from cache
  - Updating webmozart/assert (1.5.0 => 1.7.0): Loading from cache
Writing lock file
Generating autoload files

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)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [ ] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [ ] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.
• [ ] All new and existing tests passed.

[codecov[bot]]

Codecov Report

Merging #146 into master will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #146   +/-   ##
=========================================
  Coverage     86.18%   86.18%           
  Complexity      235      235           
=========================================
  Files            35       35           
  Lines          1115     1115           
=========================================
  Hits            961      961           
  Misses          154      154

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Continue to review full report at Codecov.

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