Backport changes to bump jinja2 3.1.x -> 3.1.4 #152

Job	Run time
Run Tests / Lint Code (controller)	43s
Run Tests / Lint Code (ui)	21s
Run Tests / Bundle Integration	41m 28s
Run Tests / Individual charm's integration tests (controller)	26m 5s
Run Tests / Individual charm's integration tests (ui)	25m 26s
Run Tests / Unit Test (controller)	37s
Run Tests / Unit Test (ui)	28s
Run Tests / Check libraries (jupyter-controller) / Check libraries	22s
Run Tests / Check libraries (jupyter-controller) / Lint	9s
Run Tests / Check libraries (jupyter-ui) / Check libraries	35s
Run Tests / Check libraries (jupyter-ui) / Lint	11s
Publish Charm / Generate the Charm Matrix	3s
Publish Charm / Publish Charm (./charms/jupyter-ui)	14m 14s
Publish Charm / Publish Charm (./charms/jupyter-controller)	14m 22s
	2h 5m 4s

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