[jdk8u-dev] RFR: 8221529: [TESTBUG] Docker tests use old/deprecated image on AArch64

[Dan Lutker]

Backport trivial test fix to use correct base image architecture for aarch64.

Patch applied cleanly.

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Commit messages:
 - Backport of 71ac3d952b6d5bf9eb08ec7daf07225b1ab66216

Changes: https://git.openjdk.org/jdk8u-dev/pull/166/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=166&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8221529
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk8u-dev/pull/166.diff
  Fetch: git fetch https://git.openjdk.org/jdk8u-dev pull/166/head:pull/166

PR: https://git.openjdk.org/jdk8u-dev/pull/166