cmake: Migrate away from deprecated SQLite3 target

CMake version 4.3 deprecated the imported target `Sqlite::Sqlite3`.
Use the preferred name `Sqlite3::Sqlite3` instead and provide an
alias for older versions of CMake. Also define the same alias when
using vcpkg.

CMakeLists.txt

@@ -117,8 +117,12 @@ if(ENABLE_WALLET)
   if(VCPKG_TARGET_TRIPLET)
     # Use of the `unofficial::` namespace is a vcpkg package manager convention.
     find_package(unofficial-sqlite3 CONFIG REQUIRED)
+    add_library(SQLite3::SQLite3 ALIAS unofficial::sqlite3::sqlite3)
   else()
     find_package(SQLite3 3.7.17 REQUIRED)
+    if(NOT TARGET SQLite3::SQLite3) # CMake < 4.3
+      add_library(SQLite3::SQLite3 ALIAS SQLite::SQLite3)
+    endif()
   endif()
 endif()
 cmake_dependent_option(BUILD_WALLET_TOOL "Build bitcoin-wallet tool." ${BUILD_TESTS} "ENABLE_WALLET" OFF)

src/wallet/CMakeLists.txt

@@ -38,8 +38,7 @@ target_link_libraries(bitcoin_wallet
   PRIVATE
     core_interface
     bitcoin_common
-    $<TARGET_NAME_IF_EXISTS:unofficial::sqlite3::sqlite3>
-    $<TARGET_NAME_IF_EXISTS:SQLite::SQLite3>
+    SQLite3::SQLite3
     univalue
     Boost::headers
     $<TARGET_NAME_IF_EXISTS:USDT::headers>