Update icu to v74.1

There hasn't been an official release announcement but the files are present. Assuming the release will happen 10-31 for dating purposes.

The LICENSE file wasn't present in the zip so checking it in for the moment.

Author: donny-dont

README.md

@@ -48,7 +48,7 @@ the requirements.
 
 | Library | Version | Release Date |
 |---|:---:|:---:|
-| [icu](http://site.icu-project.org) | 73.2 | 2023-06-12 |
+| [icu](http://site.icu-project.org) | 74.1 | 2023-10-31 |
 | [zlib](https://github.com/zlib-ng/zlib-ng) | 2.1.4 | 2023-10-19 |
 | [brotli](https://github.com/google/brotli) | 1.1.0 | 2023-08-31 |
 | [libressl](https://www.libressl.org) | 3.8.0 | 2023-05-26 |