release-73-2
ICU-12811 Fix CI cache retain workflow's cron schedule string
ICU-22330 build and test ICU4J with Java 17
ICU-22262 Automate environment test
ICU-22075 Adds a random waiting period (0 - 179 secs) to each test that runs as part of a high concurrency performance test setup. This will disperse commits of performance test results into the data branch over a wider time frame and drastically reduces the chance of data uploads failing after ten unsuccesful commit attempts.
ICU-22194 Add CI job to generate Github Pages using Github Actions
ICU-21251 release icu4j.jar/utilities.jar to GH Maven