Update ember-cli-fastboot to 4.12 with ember-cli-update #754

Job	Run time
lint-all-packages	36s
Legacy Mocha Tests - 16.x	38s
discover_matrix	41s
Legacy Mocha Tests - 14.x	39s
Ember Tests (16.x, ubuntu-latest)	1m 4s
Ember Tests (16.x, windows-latest)	3m 4s
Test Packages (16.x, ubuntu-latest)	1m 24s
Ember Tests (14.x, ubuntu-latest)	1m 15s
ember-try for ember-cli-fastboot: ember-lts-3.16	51s
Test Packages (16.x, windows-latest)	3m 53s
Ember Tests (14.x, windows-latest)	3m 0s
ember-try for ember-cli-fastboot: ember-lts-3.20	52s
Test Packages (14.x, ubuntu-latest)	1m 41s
ember-try for ember-cli-fastboot: ember-lts-3.24	46s
Test Packages (14.x, windows-latest)	4m 44s
ember-try for ember-cli-fastboot: ember-lts-3.28	55s
ember-try for ember-cli-fastboot: ember-lts-4.4	57s
ember-try for ember-cli-fastboot: ember-lts-4.8	59s
ember-try for ember-cli-fastboot: ember-release	53s
ember-try for ember-cli-fastboot: ember-beta	1m 3s
ember-try for ember-cli-fastboot: ember-canary	1m 8s
ember-try for ember-cli-fastboot: ember-classic	39s
ember-try for ember-cli-fastboot: embroider-safe	1m 1s
ember-try for ember-cli-fastboot: embroider-optimized	56s
ember-try for ember-cli-fastboot: no-deprecations	47s
ember-try for ember-cli-fastboot: ember-release-no-deprecations	49s
custom-output-paths	30s
ember-cli-fastboot	35s
fastboot-config-location	34s
fastboot-express-middleware	35s
fastboot-location	41s
fastboot-shoebox-test	32s
integration-tests	1m 22s
oneerror-per-visit	54s
request-details	43s
root-url	31s
	42m 12s

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