[jdk15u-dev] RFR: 8293987: Bump update version for OpenJDK: jdk-15.0.10

[Yuri Nesterenko]

To be integrated (thus switching team repo to this new version) on Wednesday, Sep 21.

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Commit messages:
 - 8293987: Bump update version for OpenJDK: jdk-15.0.10

Changes: https://git.openjdk.org/jdk15u-dev/pull/281/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk15u-dev&pr=281&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8293987
  Stats: 3 lines in 2 files changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk15u-dev/pull/281.diff
  Fetch: git fetch https://git.openjdk.org/jdk15u-dev pull/281/head:pull/281

PR: https://git.openjdk.org/jdk15u-dev/pull/281