Use `khr_default_context()` per DPC++ 2025.2 compiler deprecation warning #5462

Job	Run time
build_linux (3.9)	38m 50s
build_linux (3.10)	36m 31s
build_linux (3.11)	36m 48s
build_linux (3.12)	36m 31s
build_windows (3.9)	1h 5m 39s
build_linux (3.13)	37m 58s
build_windows (3.10)	1h 5m 53s
build_windows (3.11)	1h 7m 48s
build_windows (3.12)	1h 5m 48s
build_windows (3.13)	1h 5m 47s
array-api-conformity (3.10, false, ubuntu-22.04)	5m 33s
test_examples_linux (3.11, false, ubuntu-22.04)	7m 43s
test_linux (3.9, false, ubuntu-22.04)	10m 59s
test_linux (3.10, false, ubuntu-22.04)	11m 23s
test_linux (3.11, false, ubuntu-22.04)	10m 52s
test_linux (3.12, false, ubuntu-22.04)	10m 50s
test_linux (3.13, false, ubuntu-22.04)	10m 26s
upload_linux	0s
test_windows (3.9, false, windows-2019)	14m 45s
test_windows (3.10, false, windows-2019)	14m 19s
test_windows (3.11, false, windows-2019)	14m 14s
test_windows (3.12, false, windows-2019)	14m 5s
test_windows (3.13, false, windows-2019)	15m 28s
upload_windows	0s
Clean up anaconda packages	0s
	10h 58m 10s

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