Update dependency zendframework/zend-session to v2.9.1

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
zendframework/zend-session	require	minor	^2.7.1 -> 2.9.1

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Release Notes

zendframework/zend-session

v2.9.1

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Added

• Nothing.

Changed

• Nothing.

Deprecated

• Nothing.

Removed

• Nothing.

Fixed

• #​123 fixes a bug preventing two first hash functions from hash_algos()
  (usually md2 and md4) from being used in SessionConfig::setHashFunction.

v2.9.0

Compare Source

Added

• #​115 adds support for PHP 7.3.

Changed

• Nothing.

Deprecated

• Nothing.

Removed

• #​115 removes support for zend-stdlib v2 releases.

Fixed

• Nothing.

v2.8.7

Compare Source

Added

• Nothing.

Changed

• Nothing.

Deprecated

• Nothing.

Removed

• Nothing.

Fixed

• #​122 fixes
  type check for configuration of session storage. Allows input to be
  an instance of ArrayAccess or an array.

v2.8.6

Compare Source

Added

• Nothing.

Changed

• Nothing.

Deprecated

• Nothing.

Removed

• Nothing.

Fixed

• #​120 fixes issue
  "Commands out of sync; you can't run this command now" with DbTableGateway
  save handler while using Mysqli adapter.

• #​106 fixes issue
  with Garbage collection of MongoDB save handler where maxlifetime
  is provided in seconds.

• #​114 fixes
  Validator\Id compatibility with PHP 7.1. INI setting session.sid_bits_per_character
  can be now used with PHP 7.1+ instead of session.hash_bits_per_character
  (used with PHP versions prior to 7.1).

  In some very specific situations this can lead to an issue with previously generated sessions.
  See issue #​121.

• #​118 avoid unnecessary phpinfo() call
  when register own save handler which is an object.

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