chore: change ubuntu pinned version to ubuntu-lts-latest (#178) #947

Job	Run time
run_ci (ubuntu-24.04, 3.11, credentials+lms)	20m 22s
run_ci (ubuntu-24.04, 3.11, xqueue)	4m 37s
run_ci (ubuntu-24.04, 3.11, edx_notes_api+lms)	18m 3s
run_ci (ubuntu-24.04, 3.11, analyticsapi+insights+lms)	22m 31s
run_ci (ubuntu-24.04, 3.11, designer+lms)	20m 50s
run_ci (ubuntu-24.04, 3.11, ecommerce+lms)	22m 28s
run_ci (ubuntu-24.04, 3.11, enterprise-subsidy+enterprise-catalog+enterprise-access+lms)	24m 54s
run_ci (ubuntu-24.04, 3.11, license-manager+lms)	18m 36s
run_ci (ubuntu-24.04, 3.11, edx-exams+lms)	19m 23s
run_ci (ubuntu-24.04, 3.11, registrar+lms)	19m 58s
run_ci (ubuntu-24.04, 3.11, discovery+lms+forum)	23m 40s
	3h 35m 22s

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