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.

Github-Pull: #34848
Rebased-From: 498b6eb6b5

CMakeLists.txt

@@ -111,8 +111,12 @@ if(WITH_SQLITE)
   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()
   set(USE_SQLITE ON)
 endif()

src/wallet/CMakeLists.txt

@@ -49,8 +49,7 @@ if(USE_SQLITE)
   target_sources(bitcoin_wallet PRIVATE sqlite.cpp)
   target_link_libraries(bitcoin_wallet
     PRIVATE
-      $<TARGET_NAME_IF_EXISTS:unofficial::sqlite3::sqlite3>
-      $<TARGET_NAME_IF_EXISTS:SQLite::SQLite3>
+      SQLite3::SQLite3
   )
 endif()
 if(USE_BDB)