ci: bump juju 3.1 -> 3.5 in track (#249) #112

Job	Run time
Run Tests / Lint Check	22s
Run Tests / Unit Test	23s
Run Tests / Get integration environments	3s
Run Tests / Check libraries / Check libraries	25s
Run Tests / Check libraries / Lint	9s
Run Tests / Integration Test (build and deploy) (seldon-servers-integration -- -k sklearn-v2)	14m 22s
Run Tests / Integration Test (build and deploy) (seldon-servers-integration -- -k tf-serving)	14m 8s
Run Tests / Integration Test (build and deploy) (seldon-servers-integration -- -k xgboost-v1)	14m 26s
Run Tests / Integration Test (build and deploy) (seldon-servers-integration -- -k sklearn-v1)	17m 1s
Run Tests / Integration Test (build and deploy) (seldon-servers-integration -- -k huggingface)	18m 29s
Run Tests / Integration Test (build and deploy) (seldon-servers-integration -- -k xgboost-v2)	14m 17s
Run Tests / Integration Test (build and deploy) (seldon-servers-integration -- -k tensorflow)	15m 5s
Run Tests / Integration Test (build and deploy) (seldon-servers-integration -- -k mlflowserver-v2)	18m 46s
Run Tests / Integration Test (build and deploy) (seldon-servers-integration -- -k mlflowserver-v1)	15m 42s
Run Tests / Integration Test (build and deploy) (charm-integration --)	21m 49s
Publish Charm / Generate the Charm Matrix	4s
Publish Charm / Publish Charm (./)	4m 36s
	2h 50m 7s

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