[jdk11u-ri] RFR: 8285497: Add system property for Java SE specification maintenance version [v2]

[Justin Lu]

> This PR adds the system property: _java.specification.maintenance.version_ with a value of 2. This change is done towards the Reference Implementation of the proposed Java SE 11 Maintenance Release 2 (https://mail.openjdk.org/pipermail/jdk8u-dev/2023-February/016710.html).

Justin Lu has updated the pull request incrementally with one additional commit since the last revision:

  Backported change should reflect original commit's copyright year

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Changes:
  - all: https://git.openjdk.org/jdk11u-ri/pull/5/files
  - new: https://git.openjdk.org/jdk11u-ri/pull/5/files/b238cbb7..c6aa4d2a

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk11u-ri&pr=5&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk11u-ri&pr=5&range=00-01

  Stats: 3 lines in 3 files changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk11u-ri/pull/5.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-ri pull/5/head:pull/5

PR: https://git.openjdk.org/jdk11u-ri/pull/5