chore(deps): update dependency ember-cli-fastboot to v2.2.3

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
ember-cli-fastboot	2.2.1 -> 2.2.3

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Release Notes

ember-fastboot/ember-cli-fastboot

### [`v2.2.3`](https://togithub.com/ember-fastboot/ember-cli-fastboot/blob/HEAD/CHANGELOG.md#v223-2020-06-10) [Compare Source](https://togithub.com/ember-fastboot/ember-cli-fastboot/compare/v2.2.2...v2.2.3) ##### :bug: Bug Fix - [#​763](https://togithub.com/ember-fastboot/ember-cli-fastboot/pull/763) Prevent errors when `fastboot-body-end` is not present. ([@​rwjblue](https://togithub.com/rwjblue)) ##### :memo: Documentation - [#​762](https://togithub.com/ember-fastboot/ember-cli-fastboot/pull/762) Update documentation on shoebox. ([@​burritoIand](https://togithub.com/burritoIand)) ##### Committers: 2 - Robert Jackson ([@​rwjblue](https://togithub.com/rwjblue)) - [@​burritoIand](https://togithub.com/burritoIand) ### [`v2.2.2`](https://togithub.com/ember-fastboot/ember-cli-fastboot/blob/HEAD/CHANGELOG.md#v222-2020-04-09) [Compare Source](https://togithub.com/ember-fastboot/ember-cli-fastboot/compare/v2.2.1...v2.2.2) ##### :rocket: Enhancement - [#​752](https://togithub.com/ember-fastboot/ember-cli-fastboot/pull/752) Add support for custom configuration ([@​bobisjan](https://togithub.com/bobisjan)) ##### :bug: Bug Fix - [#​737](https://togithub.com/ember-fastboot/ember-cli-fastboot/pull/737) Fix custom app build issue [#​730](https://togithub.com/ember-fastboot/ember-cli-fastboot/issues/730) ([@​dnalagatla](https://togithub.com/dnalagatla)) ##### :memo: Documentation - [#​728](https://togithub.com/ember-fastboot/ember-cli-fastboot/pull/728) fix typo in property name isFastboot -> isFastBoot ([@​jelhan](https://togithub.com/jelhan)) ##### :house: Internal - [#​760](https://togithub.com/ember-fastboot/ember-cli-fastboot/pull/760) Re-roll yarn.lock ([@​kratiahuja](https://togithub.com/kratiahuja)) - [#​738](https://togithub.com/ember-fastboot/ember-cli-fastboot/pull/738) Re-roll yarn.lock. ([@​rwjblue](https://togithub.com/rwjblue)) ##### Committers: 5 - Dinesh Nalagatla ([@​dnalagatla](https://togithub.com/dnalagatla)) - Jan Bobisud ([@​bobisjan](https://togithub.com/bobisjan)) - Jeldrik Hanschke ([@​jelhan](https://togithub.com/jelhan)) - Krati Ahuja ([@​kratiahuja](https://togithub.com/kratiahuja)) - Robert Jackson ([@​rwjblue](https://togithub.com/rwjblue))

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