ICU-22764 Fix gendict memory safety in toml uchars mode

(cherry picked from commit 23bf38f)

ICU-22535 Integrate CLDR 45 release beta5

ICU-22534 add mf2 to docmain.h

ICU-22583 BRS74: Version number update for 74.2

See #2734

ICU-22326 ICU 74 release not candidate

ICU-22324 Add docs for Maven usage

See #2655

ICU-22325 BRS74 ICU4J API signature file

ICU-22325: tag icu main @7a037341... for use in CLDR

ICU-22325: tag icu main @2df1ab72... for use in CLDR

ICU-22325: tag icu main @bb735299... for use in CLDR