Revert "src: make process.env.TZ setter clear tz cache"
This reverts commit 1d1ab76e.
Fixes: https://github.com/nodejs/node/issues/20227
When landing #20026 I missed failures on Alpine and I could not find a easy way to detect Alpine builds right now, so I decided to revert this until we find a proper fix.
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
documentation is changed or added -
commit message follows commit guidelines