Based on https://github.com/zendframework/zend-json/releases/tag/release-3.1.2 (commit 1230fb3188fdb3ccf0876521ddcba2df41aea7bf in this repo)

Added
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- Nothing.

Changed
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- Nothing.

Deprecated
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- Nothing.

Removed
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- Nothing.

Fixed
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- [zendframework/zend-json#46](https://github.com/zendframework/zend-json/pull/46) changes
  curly braces in array and string offset access to square brackets
  in order to prevent issues under the upcoming PHP 7.4 release.

- [zendframework/zend-json#37](https://github.com/zendframework/zend-json/pull/37) fixes
  output of `\Laminas\Json::prettyPrint` to not remove spaces after
  commas in value.