[jdk11u-dev] RFR: 8255913: Decrease number of iterations in TestMaxCachedBufferSize

[Andrew Lu]

I backport this for parity with 11.0.25-oracle.

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Commit messages:
 - Backport d6f094040085fb16306fd1e0eea7d8d7969cdb4d

Changes: https://git.openjdk.org/jdk11u-dev/pull/2885/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2885&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8255913
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2885.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2885/head:pull/2885

PR: https://git.openjdk.org/jdk11u-dev/pull/2885