Bump php-date-formatter from 1.3.4 to 1.3.6 (#467)

Bumps [php-date-formatter](https://github.com/kartik-v/php-date-formatter) from 1.3.4 to 1.3.6.
- [Release notes](https://github.com/kartik-v/php-date-formatter/releases)
- [Commits](kartik-v/php-date-formatter@v1.3.4...v1.3.6)

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