[jdk11u-dev] RFR: 8351099: Bump update version of OpenJDK: 11.0.28

[Andrew John Hughes]

Rampdown for 11.0.27 [has begun](https://mail.openjdk.org/pipermail/jdk-updates-dev/2025-March/041774.html). 11u-dev needs to transition to 11.0.28.

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Commit messages:
 - 8351099: Bump update version of OpenJDK: 11.0.28

Changes: https://git.openjdk.org/jdk11u-dev/pull/3009/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=3009&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8351099
  Stats: 4 lines in 2 files changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/3009.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/3009/head:pull/3009

PR: https://git.openjdk.org/jdk11u-dev/pull/3009