Update ember-cli-fastboot to 4.12 with ember-cli-update #757

Job	Run time
Test Packages (16.x, ubuntu-latest)	1m 9s
Ember Tests (16.x, ubuntu-latest)	55s
Test Packages (16.x, windows-latest)	4m 57s
Ember Tests (16.x, windows-latest)	2m 54s
lint-all-packages	38s
Test Packages (14.x, ubuntu-latest)	1m 14s
discover_matrix	22s
Ember Tests (14.x, ubuntu-latest)	52s
Test Packages (14.x, windows-latest)	2m 49s
Ember Tests (14.x, windows-latest)	2m 21s
Legacy Mocha Tests - 16.x	25s
ember-try for ember-cli-fastboot: ember-lts-3.16	44s
Legacy Mocha Tests - 14.x	25s
ember-try for ember-cli-fastboot: ember-lts-3.20	44s
ember-try for ember-cli-fastboot: ember-lts-3.24	1m 0s
ember-try for ember-cli-fastboot: ember-lts-3.28	1m 2s
ember-try for ember-cli-fastboot: ember-lts-4.4	49s
ember-try for ember-cli-fastboot: ember-lts-4.8	45s
ember-try for ember-cli-fastboot: ember-release	44s
ember-try for ember-cli-fastboot: ember-beta	51s
ember-try for ember-cli-fastboot: ember-canary	54s
ember-try for ember-cli-fastboot: embroider-safe	57s
ember-try for ember-cli-fastboot: embroider-optimized	57s
ember-try for ember-cli-fastboot: no-deprecations	42s
ember-try for ember-cli-fastboot: ember-release-no-deprecations	47s
custom-output-paths	34s
ember-cli-fastboot	36s
fastboot-config-location	31s
fastboot-express-middleware	34s
fastboot-location	36s
fastboot-shoebox-test	38s
integration-tests	1m 25s
oneerror-per-visit	1m 0s
request-details	40s
root-url	33s
	37m 4s

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