<i18n dev> RFR: 8341658: RISC-V: Test DateFormatProviderTest.java run timeouted

[SendaoYan]

Hi all,
The test `java/util/PluggableLocale/DateFormatProviderTest.java` run timeout on riscv64 physic machine. This test has 4496 sub-tests, and riscv64 has poor single core performance, so this test run timeouted on riscv64 seems acceptable.
Thus, to make less test noisy, I think we should add more timeout value for this test.
Test-fix only, no risk.

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Commit messages:
 - 8341658: RISC-V: Test DateFormatProviderTest.java run timeouted

Changes: https://git.openjdk.org/jdk/pull/21393/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21393&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8341658
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/21393.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21393/head:pull/21393

PR: https://git.openjdk.org/jdk/pull/21393