chore: update node to v20, remove travis, update ci actions #108

Job	Run time
Lint	35s
Floating Dependencies (ubuntu-latest, chrome)	1m 34s
Tests (ubuntu-latest, chrome)	39s
Tests - ember-lts-3.20	4m 39s
Tests - ember-lts-3.24	2m 17s
Tests - ember-release	39s
Tests - ember-beta	42s
Tests - ember-canary	41s
Tests - ember-default-with-jquery	2m 15s
Tests - ember-classic	2m 11s
Tests - embroider-safe	2m 10s
Tests - embroider-optimized	2m 22s
	20m 44s

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