Merge pull request #559 from nandanvasudevan/master

Updating Catch2 v2 to v2.13.9

Author: gummif

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)