RFR: 8266318: Switch to macos prefix for macOS bundles [v2]

[Mikael Vidstedt]

> Apple rebranded the operating system as "macOS" back in 2016. The JDK bundles files are still use the legacy "osx" string. They should be modernized to use "macos" instead.

Mikael Vidstedt has updated the pull request incrementally with one additional commit since the last revision:

  Fix GHA

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/3801/files
  - new: https://git.openjdk.java.net/jdk/pull/3801/files/1732c917..fb851a34

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=3801&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=3801&range=00-01

  Stats: 10 lines in 1 file changed: 0 ins; 0 del; 10 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3801.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3801/head:pull/3801

PR: https://git.openjdk.java.net/jdk/pull/3801