Updating Catch2 v2 to v2.13.9

Fixes issue with MINSIGSTKSZ which is no longer a constant -> JuliaLang/julia#39822

Issue was fixed in https://github.com/catchorg/Catch2/releases/tag/v2.13.5

Author: nandanvasudevan

tests/CMakeLists.txt

@@ -8,7 +8,7 @@ if (NOT Catch2_FOUND)
   FetchContent_Declare(
     Catch2
     GIT_REPOSITORY https://github.com/catchorg/Catch2.git
-    GIT_TAG        v2.13.4)
+    GIT_TAG        v2.13.9)
 
   FetchContent_MakeAvailable(Catch2)