test: update Catch2 to use version 2.11.0

Author: henryborchers

tests/CMakeLists.txt

@@ -3,9 +3,9 @@ if(BUILD_TESTING)
 
     FetchContent_Declare(
         libcatch2
-        URL https://github.com/catchorg/Catch2/archive/v2.13.6.tar.gz
-#        GIT_REPOSITORY https://github.com/catchorg/Catch2.git
-#        GIT_TAG 15cf3ca
+        URL https://github.com/catchorg/Catch2/archive/v2.11.0.tar.gz
+        URL_HASH SHA1=debe7860b3c52d362f6c177ebe0033f8d69de1a6
+        DOWNLOAD_EXTRACT_TIMESTAMP true
     )
 
     FetchContent_MakeAvailable(libcatch2)