Refactor: changed cereal url with codeload (#6408)

* Update FetchContent URL for cereal to use the latest master version

* Use std::abs instead of abs to suppress warning message
"using integer absolute value function 'abs' when argument is of floating point type [-Wabsolute-value]"

Author: kluophysics

cmake/FindCereal.cmake

@@ -15,7 +15,7 @@ if(NOT CEREAL_INCLUDE_DIR)
     include(FetchContent)
     FetchContent_Declare(
         cereal
-        URL https://github.com/USCiLab/cereal/archive/refs/tags/v1.3.2.tar.gz
+        URL https://codeload.github.com/USCiLab/cereal/tar.gz/master
     )
     FetchContent_Populate(cereal)
     set(CEREAL_INCLUDE_DIR ${cereal_SOURCE_DIR}/include)

source/source_estate/magnetism.cpp

@@ -84,7 +84,7 @@ void Magnetism::compute_mag(const double& omega,
 		{
 			this->tot_mag_nc[i] *= omega/ nxyz;
             // mohan add 2025-06-21
-			if( abs(this->tot_mag_nc[i]) < 1.0e-16)
+			if( std::abs(this->tot_mag_nc[i]) < 1.0e-16)
 			{
 				this->tot_mag_nc[i] = 0.0;
 			}