Update dependency zendframework/zend-mime to v2.7.2

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
zendframework/zend-mime	require	patch	^2.7 -> 2.7.2

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Release Notes

zendframework/zend-mime

v2.7.2

Compare Source

Added

• #​37 adds support for PHP 7.3.

Changed

• Nothing.

Deprecated

• Nothing.

Removed

• Nothing.

Fixed

• #​36 fixes
  Zend\Mime\Decode::splitMessage to set Zend\Mail\Headers
  instance always for $headers parameter. Before, when messages
  without headers was provided, $headers was an empty array.

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