PHP dependencies 20200513

[phil-davis]

Description

1. Update league/flysystem (1.0.67 => 1.0.68)
   https://github.com/thephpleague/flysystem/releases/tag/1.0.68

2. Update symfony/polyfill (1.16.0 => 1.17.0)

composer update
Loading composer repositories with package information
Updating dependencies (including require-dev)
Package operations: 0 installs, 6 updates, 0 removals
  - Updating symfony/polyfill-iconv (v1.16.0 => v1.17.0): Loading from cache
  - Updating symfony/polyfill-php72 (v1.16.0 => v1.17.0): Loading from cache
  - Updating symfony/polyfill-mbstring (v1.16.0 => v1.17.0): Loading from cache
  - Updating symfony/polyfill-intl-idn (v1.16.0 => v1.17.0): Loading from cache
  - Updating symfony/polyfill-php73 (v1.16.0 => v1.17.0): Loading from cache
  - Updating symfony/polyfill-ctype (v1.16.0 => v1.17.0): Loading from cache

https://github.com/symfony/polyfill/releases/tag/v1.17.0

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