ci: bump upload-charm action 2.4.0 -> 2.6.2 (#387) #141

Job	Run time
Run Tests / Bundle Integration	17m 47s
Run Tests / Individual charm's integration tests (controller)	18m 34s
Run Tests / Lint Code (controller)	23s
Run Tests / Individual charm's integration tests (ui)	12m 23s
Run Tests / Lint Code (ui)	26s
Run Tests / Unit Test (controller)	27s
Run Tests / Unit Test (ui)	29s
Run Tests / Check libraries (jupyter-controller) / Check libraries	30s
Run Tests / Check libraries (jupyter-controller) / Lint	9s
Run Tests / Check libraries (jupyter-ui) / Check libraries	29s
Run Tests / Check libraries (jupyter-ui) / Lint	8s
Publish Charm / Generate the Charm Matrix	3s
Publish Charm / Publish Charm (./charms/jupyter-controller)	3m 36s
Publish Charm / Publish Charm (./charms/jupyter-ui)	3m 49s
	59m 13s

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