- Upstream gates catch2_min_version at 3.14 but Gentoo ships only 3.13.
- find_package fails, FetchContent_MakeAvailable git-clones Catch2 at
build time and dies in network-sandbox (CF0014).
- Patch the floor to 3.13 so find_package matches dev-cpp/catch.
Closes: https://bugs.gentoo.org/975580
Signed-off-by: Huang Rui <vowstar@gmail.com>
