RFR: CODETOOLS-7902809: Remove prerequisites tag in favor of maven-enforcer-plugin

[Aleksey Shipilev]

<prerequisites> tag is deprecated in favor of maven-enforcer-plugin:
https://maven.apache.org/enforcer/maven-enforcer-plugin/faq.html

We should use maven-enforcer-plugin consistently.

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Commit messages:
 - CODETOOLS-7902809: Remove prerequisites tag in favor of maven-enforcer-plugin

Changes: https://git.openjdk.java.net/jmh/pull/14/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jmh&pr=14&range=00
  Issue: https://bugs.openjdk.java.net/browse/CODETOOLS-7902809
  Stats: 5 lines in 1 file changed: 0 ins; 4 del; 1 mod
  Patch: https://git.openjdk.java.net/jmh/pull/14.diff
  Fetch: git fetch https://git.openjdk.java.net/jmh pull/14/head:pull/14

PR: https://git.openjdk.java.net/jmh/pull/14