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fix(util): tolerate deleted temporary environment variables #3161

Job	Run time
install/import (ubuntu-latest, 3.10)	15s
install/import (windows-latest, 3.9)	51s
install/import (macos-latest, 3.8)	1m 42s
install/import (macos-latest, 3.9)	31s
install/import (macos-latest, 3.10)	34s
install/import (ubuntu-24.04, 3.8)	16s
test (ubuntu, 3.11)	4m 8s
install/import (windows-latest, 3.10)	1m 12s
install/import (ubuntu-24.04, 3.9)	17s
install/import (windows-latest, 3.8)	55s
test (ubuntu, 3.14)	4m 1s
test (macos, 3.12)	17m 44s
test (ubuntu, 3.14t)	5m 7s
test (macos, 3.14)	16m 27s
test (ubuntu, 3.15)	4m 43s
test (macos, 3.15)	10m 34s
test (ubuntu, 3.15t)	5m 11s
test (ubuntu, 3.13)	4m 45s
test (ubuntu, 3.12)	6m 17s
test (macos, 3.11)	15m 15s
test (windows, 3.12, gix)	41m 44s
test (windows, 3.15t)	41m 19s
test (macos, 3.13)	14m 26s
test (ubuntu, 3.12, gix)	5m 15s
test (macos, 3.12, gix)	11m 15s
test (windows, 3.15)	28m 15s
test (windows, 3.12)	58m 40s
test (windows, 3.11)	59m 49s
test (windows, 3.13)	1h 2m 55s
test (windows, 3.14)	34m 27s
test (windows, 3.14t)	43m 34s
	8h 22m 24s