fix: update macOS image to latest and simplify colima start command #1096

Job	Run time
run_ci (ubuntu-24.04, 3.11, registrar+lms)	17m 21s
run_ci (ubuntu-24.04, 3.11, credentials+lms)	18m 32s
run_ci (ubuntu-24.04, 3.11, discovery+lms+forum)	22m 11s
run_ci (ubuntu-24.04, 3.11, edx_notes_api+lms)	18m 28s
run_ci (ubuntu-24.04, 3.11, xqueue)	2m 3s
run_ci (ubuntu-24.04, 3.11, enterprise-subsidy+enterprise-catalog+enterprise-access+lms)	24m 6s
run_ci (ubuntu-24.04, 3.11, license-manager+lms)	18m 20s
run_ci (ubuntu-24.04, 3.11, edx-exams+lms)	16m 42s
run_ci (ubuntu-24.04, 3.11, designer+lms)	17m 52s
run_ci (ubuntu-24.04, 3.11, analyticsapi+insights+lms)	23m 4s
run_ci (ubuntu-24.04, 3.11, ecommerce+lms)	20m 9s
	3h 18m 48s

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