ICU-22923 Update README.md for 77.1

Author: mihnita

README.md

@@ -9,7 +9,7 @@
 
 |           |   C                              |             J                    |
 |-----------|----------------------------------|----------------------------------|
-| Released  | [icu4c 76.1](./apidoc/released/icu4c) | [icu4j 76.1](./apidoc/released/icu4j) |
+| Released  | [icu4c 77.1](./apidoc/released/icu4c) | [icu4j 77.1](./apidoc/released/icu4j) |
 | Dev       | [icu4c 77rc](./apidoc/dev/icu4c)      | [icu4j 77rc](./apidoc/dev/icu4j)      |
 
 ## Other Docs