CI: don't unset default interpreter when setting pex tool (#268) #815

Job	Run time
Test wheel_resolver (Python 3.11) / Run tests	10s
Test wheel_resolver (Python 3.9) / Run tests	12s
Test wheel_resolver (Python 3.14) / Run tests	43s
Test wheel_resolver (Python 3.12) / Run tests	13s
Test (Python 3.11, in-repo please_pex) / Run tests	1m 5s
Test (Python 3.12, in-repo please_pex) / Run tests	1m 7s
Test wheel_resolver (Python 3.10) / Run tests	12s
Test (Python 3.13, in-repo please_pex) / Run tests	1m 9s
Test (Python 3.14, in-repo please_pex) / Run tests	1m 13s
Test (Python 3.9, in-repo please_pex) / Run tests	1m 5s
Test (Python 3.10, in-repo please_pex) / Run tests	1m 10s
Test wheel_resolver (Python 3.13) / Run tests	13s
Test (Python 3.11, stable please_pex release) / Run tests	47s
Test (Python 3.14, stable please_pex release) / Run tests	48s
Test (Python 3.9, stable please_pex release) / Run tests	51s
Test (Python 3.10, stable please_pex release) / Run tests	1m 0s
Test (Python 3.12, stable please_pex release) / Run tests	49s
Test (Python 3.13, stable please_pex release) / Run tests	49s
Release wheel_resolver	10s
Release plugin	4s
Release please_pex	2m 3s
	15m 53s

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