Update ICU library versions for Ubuntu installation

Author: adegeo

docs/core/install/linux-ubuntu-decision.md

@@ -333,7 +333,8 @@ When you install with a package manager, these libraries are installed for you.
 - libicu66 (for 20.x)
 - libicu70 (for 22.04)
 - libicu72 (for 23.10)
-- libicu74 (for 24.04 or later)
+- libicu74 (for 24.04)
+- libicu76 (for 25.04 or later)
 - liblttng-ust1 (for 22.x or later)
 - libssl1.0.0 (for 16.x)
 - libssl1.1 (for 18.x, 20.x)