Fix formatting of environment markers in pyproject.toml. #1138

Job	Run time
Lint C++	32s
Pre-build on macos-13 with clang	1m 29s
Lint Python (3.12, ubuntu-20.04)	14s
Pre-build on ubuntu-20.04 with clang	42s
Pre-build on ubuntu-20.04 with gcc	1m 18s
Build wheel for ${{ matrix.build }}	0s
Test with Python 3.7 + Address Sanitizer	7m 42s
Test with Python 3.8 + Address Sanitizer	11m 34s
Test with Python 3.9 + Address Sanitizer	7m 58s
Test with Python 3.10 + Address Sanitizer	7m 42s
Test with Python 3.11 + Address Sanitizer	7m 43s
Test 1 / 8 with Python 3.12 on ubuntu-20.04	1m 7s
Test 2 / 8 with Python 3.12 on ubuntu-20.04	1m 17s
Test 3 / 8 with Python 3.12 on ubuntu-20.04	1m 17s
Test 4 / 8 with Python 3.12 on ubuntu-20.04	1m 13s
Test 5 / 8 with Python 3.12 on ubuntu-20.04	1m 8s
Test 6 / 8 with Python 3.12 on ubuntu-20.04	1m 18s
Test 7 / 8 with Python 3.12 on ubuntu-20.04	1m 15s
Test 8 / 8 with Python 3.12 on ubuntu-20.04	1m 7s
Test with Python 3.7 on macos-13	9m 33s
Test with Python 3.8 on macos-13	9m 33s
Test with Python 3.9 on macos-13	11m 2s
Test with Python 3.10 on macos-13	9m 57s
Test with Python 3.11 on macos-13	9m 35s
Test with Python 3.12 on macos-13	8m 37s
Test with Python 3.7 on ubuntu-20.04	5m 16s
Test with Python 3.8 on ubuntu-20.04	5m 35s
Test with Python 3.9 on ubuntu-20.04	5m 58s
Test with Python 3.10 on ubuntu-20.04	5m 33s
Test with Python 3.11 on ubuntu-20.04	5m 40s
Test with Python 3.12 on ubuntu-20.04	4m 59s
Test with Python 3.12 on windows-latest	9m 56s
Upload wheels to PyPI	0s
	2h 37m 50s

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