Updating swiftmailer/swiftmailer (v6.2.1 => v6.2.3)

[phil-davis]

Description

composer update
Loading composer repositories with package information
Updating dependencies (including require-dev)
Package operations: 0 installs, 1 update, 0 removals
  - Updating swiftmailer/swiftmailer (v6.2.1 => v6.2.3): Loading from cache

https://github.com/swiftmailer/swiftmailer/releases/tag/v6.2.3

It is just a small change for PHP 7.4 compatibility.

I noticed this was released, while doing changelogs... so may as well get it in now with changelog entry.

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 #36417 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master   #36417   +/-   ##
=========================================
  Coverage     64.87%   64.87%           
  Complexity    19792    19792           
=========================================
  Files          1271     1271           
  Lines         74723    74723           
  Branches       1309     1309           
=========================================
  Hits          48479    48479           
  Misses        25858    25858           
  Partials        386      386

Flag	Coverage Δ	Complexity Δ
#javascript	54% <ø> (ø)	0 <ø> (ø)	⬇️
#phpunit	66.07% <ø> (ø)	19792 <ø> (ø)	⬇️

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