Revert back to auto-fetch Catch2 (v3) if not found

Signed-off-by: Christian Parpart <[email protected]>

Author: christianparpart

CMakeLists.txt

@@ -54,7 +54,10 @@ install(EXPORT boxed-cpp-targets
 
 option(BOXED_CPP_TESTS "Enables building of unittests for boxed-cpp [default: OFF]" OFF)
 if(BOXED_CPP_TESTS)
-    find_package(Catch2 REQUIRED)
+    find_package(Catch2 3.4.0 QUIET)
+    if(NOT Catch2_FOUND)
+        ThirdPartiesAdd_Catch2()
+    endif()
     enable_testing()
     add_executable(test-boxed-cpp
         test-boxed-cpp.cpp