Bump required minimal Z3 version from 4.7.1 to 4.8.9 (#96682)

https://discourse.llvm.org/t/bump-minimal-z3-requirements-from-4-7-1-to-4-8-9/79664

This supposed to unblock #95128 and #95129.

Author: steakhal

llvm/CMakeLists.txt

@@ -572,11 +572,11 @@ option(LLVM_ENABLE_Z3_SOLVER
 )
 
 if (LLVM_ENABLE_Z3_SOLVER)
-  find_package(Z3 4.7.1)
+  find_package(Z3 4.8.9)
 
   if (LLVM_Z3_INSTALL_DIR)
     if (NOT Z3_FOUND)
-      message(FATAL_ERROR "Z3 >= 4.7.1 has not been found in LLVM_Z3_INSTALL_DIR: ${LLVM_Z3_INSTALL_DIR}.")
+      message(FATAL_ERROR "Z3 >= 4.8.9 has not been found in LLVM_Z3_INSTALL_DIR: ${LLVM_Z3_INSTALL_DIR}.")
     endif()
   endif()