update to Ember v5.9 #6574

Job	Run time
Lint	29s
frontend Build With Embroider	2m 46s
frontend Build (20)	1m 52s
test-app Build (20)	1m 25s
frontend Test With Embroider	4m 35s
lti-course-manager Test With Embroider	1m 5s
lti-course-manager Build (20)	1m 24s
lti-course-manager Build With Embroider	2m 32s
lti-dashboard Test With Embroider	1m 3s
lti-dashboard Build (20)	1m 28s
lti-dashboard Build With Embroider	2m 36s
${{ matrix.workspace }} Test (${{ matrix.node-version }})	0s
Browser Stack Test	0s
Scan with UCSF SonarQube	0s
${{ matrix.workspace }} Firefox ${{ matrix.firefox-version }}	0s
Test and Capture Screenshots	0s
	21m 15s

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