Update spdlog dependency to version 1.15.3

Author: zfergus

cmake/recipes/spdlog.cmake

@@ -10,7 +10,7 @@ option(SPDLOG_INSTALL "Generate the install target" ON)
 set(CMAKE_INSTALL_DEFAULT_COMPONENT_NAME "spdlog")
 
 include(CPM)
-CPMAddPackage("gh:gabime/spdlog@1.11.0")
+CPMAddPackage("gh:gabime/spdlog@1.15.3")
 
 set_target_properties(spdlog PROPERTIES POSITION_INDEPENDENT_CODE ON)