[GSK-4014] Set encoding as utf-8 for all open statements #4033

Job	Run time
Build and check doc	9m 28s
Check if wheel can be installed with PDM	1m 59s
Check if wheel can be installed with pip	1m 9s
Check if wheel can be installed with using Poetry	1m 18s
Python 3.9 on ubuntu-latest	20m 53s
Python 3.10 on ubuntu-latest	22m 9s
Python 3.11 on ubuntu-latest	17m 56s
Python 3.12 on ubuntu-latest	23m 53s
Python 3.10 on windows-2022	20m 26s
Python 3.10 on macos-latest	12m 46s
Python 3.10 (Pydantic V1) on ubuntu-latest	20m 49s
Python 3.10 (Pandas V1) on ubuntu-latest	21m 13s
Python 3.10 (Minimal langchain) on ubuntu-latest	20m 39s
retry-on-failure	0s
	3h 14m 38s

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