[tor-bugs] #26455 [Core Tor/Tor]: use correct CARGO_HOME in test_rust.sh

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#26455: use correct CARGO_HOME in test_rust.sh
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 Reporter:  catalyst                          |          Owner:  catalyst
     Type:  defect                            |         Status:
                                              |  needs_review
 Priority:  Medium                            |      Milestone:  Tor:
                                              |  0.3.3.x-final
Component:  Core Tor/Tor                      |        Version:
 Severity:  Normal                            |     Resolution:
 Keywords:  rust, tor-ci, tor-test, fast-fix  |  Actual Points:
Parent ID:                                    |         Points:
 Reviewer:                                    |        Sponsor:
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Comment (by chelseakomlo):

 Good catch. We also set CARGO_HOME in `Makefile.in` so this should likely
 be updated as well?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/26455#comment:2>
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