ICU-22922 BRS77 Update ICU4J serialization test data

[mihnita]

BRS 77 sheet, line 65, "Add ICU4J serialization test data"

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• Required: Issue filed: ICU-22922
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[markusicu]

Should we delete the ICU 73 data like @yumaoka did in #3220 ?

I also don't know why we still have ICU 3.6 data, but I guess that's for another day.

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Notice: the branch changed across the force-push!

• icu4j/main/core/src/test/resources/com/ibm/icu/dev/test/serializable/data/ICU_73.1/com.ibm.icu.message2.Mf2DataModel$OrderedMap.dat is now changed in the branch
• icu4j/main/core/src/test/resources/com/ibm/icu/dev/test/serializable/data/ICU_73.1/com.ibm.icu.text.ChineseDateFormat.dat is now changed in the branch
• icu4j/main/core/src/test/resources/com/ibm/icu/dev/test/serializable/data/ICU_73.1/com.ibm.icu.text.ChineseDateFormatSymbols.dat is now changed in the branch
• icu4j/main/core/src/test/resources/com/ibm/icu/dev/test/serializable/data/ICU_73.1/com.ibm.icu.text.DateFormat.dat is now changed in the branch
• icu4j/main/core/src/test/resources/com/ibm/icu/dev/test/serializable/data/ICU_73.1/com.ibm.icu.text.DateFormatSymbols.dat is now changed in the branch
• icu4j/main/core/src/test/resources/com/ibm/icu/dev/test/serializable/data/ICU_73.1/com.ibm.icu.text.SimpleDateFormat.dat is now changed in the branch
• icu4j/main/core/src/test/resources/com/ibm/icu/dev/test/serializable/data/ICU_73.1/com.ibm.icu.util.BuddhistCalendar.dat is now changed in the branch
• icu4j/main/core/src/test/resources/com/ibm/icu/dev/test/serializable/data/ICU_73.1/com.ibm.icu.util.EthiopicCalendar.dat is now changed in the branch
• icu4j/main/core/src/test/resources/com/ibm/icu/dev/test/serializable/data/ICU_73.1/com.ibm.icu.util.IndianCalendar.dat is now changed in the branch
• icu4j/main/core/src/test/resources/com/ibm/icu/dev/test/serializable/data/ICU_73.1/com.ibm.icu.util.IslamicCalendar.dat is now changed in the branch
• icu4j/main/core/src/test/resources/com/ibm/icu/dev/test/serializable/data/ICU_73.1/com.ibm.icu.util.JapaneseCalendar.dat is now changed in the branch
• icu4j/main/core/src/test/resources/com/ibm/icu/dev/test/serializable/data/ICU_73.1/com.ibm.icu.util.TaiwanCalendar.dat is now changed in the branch

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[mihnita]

Should we delete the ICU 73 data like @yumaoka did in #3220 ?

I was thinking to do that in the release BRS.
But sure, no problem.

I also don't know why we still have ICU 3.6 data, but I guess that's for another day.

The doc says "You may delete very old versions of the API signature files. We keep last 5 versions including a new release and ICU_3.6."

I don't know why, but...

[yumaoka]

ICU_3.6 is the starting point that we guaranteed serialization compatibility. This is the reason why we keep ICU_3.6 data.