update to Ember v5.9 #6578

Job	Run time
frontend Test With Embroider	3m 25s
frontend Build (20)	2m 9s
lti-course-manager Test With Embroider	1m 2s
frontend Build With Embroider	2m 50s
test-app Build (20)	1m 27s
lti-course-manager Build (20)	1m 24s
lti-course-manager Build With Embroider	2m 31s
lti-dashboard Test With Embroider	1m 6s
lti-dashboard Build With Embroider	2m 39s
Lint	1m 5s
lti-dashboard Build (20)	1m 24s
frontend Test (20)	2m 14s
test-app Test (20)	2m 8s
lti-course-manager Test (20)	1m 1s
lti-dashboard Test (20)	1m 3s
Browser Stack Test	1s
Scan with UCSF SonarQube	1s
${{ matrix.workspace }} Firefox ${{ matrix.firefox-version }}	1s
Test and Capture Screenshots	1s
	27m 32s

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