Pin Ubuntu to 22 for firefox tests #10179

Job	Run time
Type Checking (current version)	1m 19s
Linting	1m 12s
Basic Test	1m 39s
Blueprint Tests	5m 8s
Type Checking (other supported versions) (4.9)	1m 5s
Type Checking (other supported versions) (5.0)	1m 12s
Type Checking (other supported versions) (5.1)	1m 2s
Type Checking (other supported versions) (5.2)	1m 4s
Type Checking (other supported versions) (5.3)	1m 12s
Browserstack Tests (Safari, Edge)	5m 59s
Smoke tests (Full Ember Apps) (classic-basics)	1m 15s
Node.js Tests	1m 0s
Browser Tests (Firefox)	1m 52s
Smoke tests (Full Ember Apps) (embroider-basics)	1m 34s
All deprecations enabled	1m 37s
All deprecations enabled, with optional features	1m 31s
Deprecations as errors	1m 30s
Deprecations as errors, with optional features	1m 33s
Production build	1m 30s
Production build, with optional features	1m 30s
Publish channel to s3	1m 22s
Publish alpha from default branch	0s
Notify Discord	0s
Deploy tags to npm	0s
	37m 6s

Provide feedback