update to Ember v5.9 #6576

Job	Run time
Lint	30s
frontend Test With Embroider	4m 39s
frontend Build (20)	1m 45s
lti-course-manager Test With Embroider	1m 4s
test-app Build (20)	1m 20s
frontend Build With Embroider	2m 44s
lti-dashboard Test With Embroider	1m 0s
lti-course-manager Build (20)	1m 21s
lti-course-manager Build With Embroider	2m 29s
lti-dashboard Build (20)	1m 21s
lti-dashboard Build With Embroider	2m 27s
${{ matrix.workspace }} Test (${{ matrix.node-version }})	0s
Browser Stack Test	0s
${{ matrix.workspace }} Firefox ${{ matrix.firefox-version }}	0s
Scan with UCSF SonarQube	0s
Test and Capture Screenshots	0s
	20m 40s

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