[jdk8u-dev] RFR: 8315280: Bump update version of OpenJDK: 8u402

[Andrew John Hughes]

Rampdown for 8u392 has begun. 8u-dev needs to transition to 8u402.

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Commit messages:
 - 8315280: Bump update version of OpenJDK: 8u402

Changes: https://git.openjdk.org/jdk8u-dev/pull/360/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=360&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8315280
  Stats: 2 lines in 2 files changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk8u-dev/pull/360.diff
  Fetch: git fetch https://git.openjdk.org/jdk8u-dev.git pull/360/head:pull/360

PR: https://git.openjdk.org/jdk8u-dev/pull/360