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Add explicit encoding to read_text. #1174

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Job	Run time
Build - Linux CPython 3.9	53s
Test - Linux CPython 3.8	23s
Test - Linux CPython 3.9	19s
Check Newsfragment - CPython 3.11	17s
Test - Linux CPython 3.10	23s
Test - Windows CPython 3.9	57s
Check mypy - CPython 3.11	24s
Test - Linux CPython 3.11	19s
Test - Linux CPython 3.12	24s
Test - Linux PyPy 3.8	44s
Combine & check coverage.	6s
All success	1s
Check tag and publish	0s
	5m 10s