Update ember-cli-fastboot to 4.12 with ember-cli-update #756

Job	Run time
Legacy Mocha Tests - 16.x	37s
Ember Tests (16.x, ubuntu-latest)	1m 1s
Legacy Mocha Tests - 14.x	39s
lint-all-packages	37s
discover_matrix	37s
Ember Tests (16.x, windows-latest)	3m 0s
Ember Tests (14.x, ubuntu-latest)	1m 1s
Ember Tests (14.x, windows-latest)	2m 31s
Test Packages (16.x, ubuntu-latest)	1m 22s
Test Packages (16.x, windows-latest)	4m 10s
Test Packages (14.x, ubuntu-latest)	1m 27s
Test Packages (14.x, windows-latest)	2m 39s
ember-try for ember-cli-fastboot: ember-lts-3.16	1m 6s
ember-try for ember-cli-fastboot: ember-lts-3.20	55s
ember-try for ember-cli-fastboot: ember-lts-3.24	1m 11s
ember-try for ember-cli-fastboot: ember-lts-3.28	1m 0s
ember-try for ember-cli-fastboot: ember-lts-4.4	54s
ember-try for ember-cli-fastboot: ember-lts-4.8	1m 6s
ember-try for ember-cli-fastboot: ember-release	47s
ember-try for ember-cli-fastboot: ember-beta	57s
ember-try for ember-cli-fastboot: ember-canary	56s
ember-try for ember-cli-fastboot: embroider-safe	58s
ember-try for ember-cli-fastboot: embroider-optimized	54s
ember-try for ember-cli-fastboot: no-deprecations	50s
ember-try for ember-cli-fastboot: ember-release-no-deprecations	44s
custom-output-paths	37s
ember-cli-fastboot	32s
fastboot-config-location	36s
fastboot-express-middleware	33s
fastboot-location	37s
fastboot-shoebox-test	32s
integration-tests	1m 23s
oneerror-per-visit	53s
request-details	39s
root-url	40s
	39m 1s

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