Use ascii encoding when locale is not set #1272

Job	Run time
Run CI / Build / Build	1m 9s
Run CI / Generate docs / Generate docs	52s
Run CI / Run unit tests / Run unit tests (ubuntu-latest, 3.8)	48s
Run CI / Run unit tests / Run unit tests (ubuntu-latest, 3.9)	50s
Run CI / Run unit tests / Run unit tests (ubuntu-latest, 3.10)	47s
Run CI / Run unit tests / Run unit tests (ubuntu-latest, 3.11)	42s
Run CI / Run unit tests / Run unit tests (ubuntu-latest, 3.12)	56s
Run CI / Run unit tests / Run unit tests (windows-latest, 3.8)	1m 26s
Run CI / Run unit tests / Run unit tests (windows-latest, 3.9)	1m 14s
Run CI / Run unit tests / Run unit tests (windows-latest, 3.10)	1m 39s
Run CI / Run unit tests / Run unit tests (windows-latest, 3.11)	1m 10s
Run CI / Run unit tests / Run unit tests (windows-latest, 3.12)	1m 11s
Run CI / Run system tests / Run system tests (win-10-py32)	32m 24s
Run CI / Run system tests / Run system tests (win-10-py64)	31m 50s
Run CI / Report test results / Report test results	13s
	1h 17m 11s

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