drop support for node < 20 #823

Job	Run time
discover_matrix	7s
lint-all-packages	12s
Test Packages (20.x, ubuntu-latest)	12s
Test Packages (20.x, windows-latest)	32s
Legacy Mocha Tests - 20.x	10s
Test Packages (22.x, ubuntu-latest)	12s
Ember Tests (20.x, ubuntu-latest)	11s
Legacy Mocha Tests - 24.x	11s
Ember Tests (24.x, ubuntu-latest)	13s
Test Packages (24.x, ubuntu-latest)	12s
Ember Tests (22.x, windows-latest)	41s
Ember Tests (20.x, windows-latest)	32s
Ember Tests (22.x, ubuntu-latest)	10s
Ember Tests (24.x, windows-latest)	35s
Test Packages (24.x, windows-latest)	43s
ember-try for ember-cli-fastboot: ember-lts-3.24	13s
ember-try for ember-cli-fastboot: ember-lts-3.28	13s
Test Packages (22.x, windows-latest)	36s
ember-try for ember-cli-fastboot: ember-lts-4.8	10s
ember-try for ember-cli-fastboot: no-deprecations	13s
ember-try for ember-cli-fastboot: ember-lts-3.20	11s
ember-try for ember-cli-fastboot: ember-lts-3.16	13s
ember-try for ember-cli-fastboot: embroider-optimized	12s
ember-try for ember-cli-fastboot: ember-lts-5.4	13s
ember-try for ember-cli-fastboot: embroider-safe	9s
ember-try for ember-cli-fastboot: ember-release-no-deprecations	12s
ember-try for ember-cli-fastboot: ember-release	10s
ember-try for ember-cli-fastboot: ember-lts-4.4	10s
ember-try for ember-cli-fastboot: ember-lts-4.12	10s
ember-try for ember-cli-fastboot: ember-canary	12s
Legacy Mocha Tests - 22.x	12s
ember-try for ember-cli-fastboot: ember-beta	6s
matrix.name	-1s
	8m 27s

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