RFR: 8263097: Update JMH devkit to 1.28

[Claes Redestad]

Currently at 1.26, so there are a few good improvements and a few bug fixes - notably resolving a build reproducibility issue.

-------------

Commit messages:
 - Update JMH devkit to 1.28

Changes: https://git.openjdk.java.net/jdk/pull/2848/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2848&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8263097
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2848.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2848/head:pull/2848

PR: https://git.openjdk.java.net/jdk/pull/2848