8359477: com/sun/net/httpserver/Test12.java appears to have a temp file race

[GoeLin]

Clean backport form 21.

Test does not compile as https://bugs.openjdk.org/browse/JDK-8277090 8277090: jsr166 refresh for jdk19
is not in 17. That change makes ExecutorService implement Autoclosable.

Replaced missing close() by its implementation.

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Progress

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Issue

• JDK-8359477: com/sun/net/httpserver/Test12.java appears to have a temp file race (Bug - P4)

Reviewing

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[bridgekeeper]

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[openjdk]

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See the Progress checklist in the description for automated requirements.

[openjdk]

This backport pull request has now been updated with issue from the original commit.

[mlbridge]

Webrevs

• 00: Full (6081d406)