Update zendframework/zend-config requirement from ^2.4 to ^3.3

[dependabot-preview]

Updates the requirements on zendframework/zend-config to permit the latest version.

Release notes

Sourced from zendframework/zend-config's releases.

zend-config 3.3.0

Added

• #54 adds support for PHP 7.3.
• #58 adds $processSections to INI reader, allowing control over whether sections should be parsed or not
• #63 adds .yml to Zend\Config\Factory as an alternative extension for yaml

Changed

• Nothing.

Deprecated

• Nothing.

Removed

• Nothing.

Fixed

• Nothing.

Changelog

Sourced from zendframework/zend-config's changelog.

3.3.0 - 2019-06-08

Added

• #54 adds support for PHP 7.3.
• #58 adds
  $processSections to INI reader, allowing control over whether sections
  should be parsed or not
• #63 adds .yml to
  Zend\Config\Factory as an alternative extension for yaml

Changed

• Nothing.

Deprecated

• Nothing.

Removed

• Nothing.

Fixed

• Nothing.

3.2.0 - 2018-04-24

Added

• #47 adds Zend\Config\Writer\JavaProperties, a complement to
  Zend\Config\Reader\JavaProperties, for writing JavaProperties files from configuration. The writer supports
  specifying an alternate key/value delimiter (the default is ":") via the constructor.

• #46 adds a constructor option to the JavaProperties reader to allow
  users to indicate keys and values from the configuration should be trimmed of whitespace:

  $reader = new JavaProperties(
    JavaProperties::DELIMITER_DEFAULT, // or ":"
    JavaProperties::WHITESPACE_TRIM,   // or true; default is false
  );

• #45 adds the ability to specify an alternate key/value delimiter to
  the JavaProperties config reader via the constructor: $reader = new JavaProperties("=");.

• #42 adds support for PHP 7.1 and 7.2.

... (truncated)

Commits

• 0123413 3.3.0 readiness
• c98cf46 Merge branch 'develop'
• 449da43 Merge branch 'feature/63' into develop
• ae9c92c Merge branch 'feature/61' into develop
• 99164eb Merge branch 'feature/61'
• f059858 Add CHANGELOG for #63
• 1e0e36b Add yml as alternative extension for yaml
• 93b69ea Merge branch 'feature/58' into develop
• c654be5 Reformat changelog entry
• 211d046 Improve phpdoc for process sections flag getter/setter
• Additional commits viewable in compare view

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