RFR: Switch project to jdk to permit JDK reviewers, not code-tools reviewers.

[Eric Caspole]

Based on an internal discussion, we decided that having JDK reviewers is more appropriate for this project.

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Commit messages:
 - Switch project to jdk to permit JDK reviewers, not code-tools reviewers.

Changes: https://git.openjdk.org/jmh-jdk-microbenchmarks/pull/14/files
 Webrev: https://webrevs.openjdk.org/?repo=jmh-jdk-microbenchmarks&pr=14&range=00
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jmh-jdk-microbenchmarks/pull/14.diff
  Fetch: git fetch https://git.openjdk.org/jmh-jdk-microbenchmarks pull/14/head:pull/14

PR: https://git.openjdk.org/jmh-jdk-microbenchmarks/pull/14