fix(deps): update dependency ember-cli-babel to ^7.26.8

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
ember-cli-babel	^7.26.6 -> ^7.26.8

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Release Notes

babel/ember-cli-babel

### [`v7.26.8`](https://togithub.com/babel/ember-cli-babel/blob/HEAD/CHANGELOG.md#v7268-2021-12-16) [Compare Source](https://togithub.com/babel/ember-cli-babel/compare/v7.26.7...v7.26.8) ##### :bug: Bug Fix - [ea752c41](https://togithub.com/babel/ember-cli-babel/commit/ea752c41) Revert: Properly handle class properties proposal ##### Committers: 2 - Chris Krycho ([@​chriskrycho](https://togithub.com/chriskrycho)) - Robert Jackson ([@​rwjblue](https://togithub.com/rwjblue)) ### [`v7.26.7`](https://togithub.com/babel/ember-cli-babel/blob/HEAD/CHANGELOG.md#v7267-2021-12-15) [Compare Source](https://togithub.com/babel/ember-cli-babel/compare/v7.26.6...v7.26.7) ##### :bug: Bug Fix - [#​421](https://togithub.com/babel/ember-cli-babel/pull/421) introduce cacheKeyForTree to avoid running treeForX multiple times ([@​RuslanZavacky](https://togithub.com/RuslanZavacky)) - [#​420](https://togithub.com/babel/ember-cli-babel/pull/420) Properly handle class properties proposal ([@​chriskrycho](https://togithub.com/chriskrycho)) ##### Committers: 2 - Chris Krycho ([@​chriskrycho](https://togithub.com/chriskrycho)) - Ruslan Zavacky ([@​RuslanZavacky](https://togithub.com/RuslanZavacky))

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