Source: Replace uses of sprintf with safer snprintf in CMake 3.24 branch

Backport commit d5694e4623 (Source: Replace uses of sprintf with safer
snprintf, 2022-06-17, v3.25.0-rc1~587^2) to the CMake 3.24 branch. This
is needed to compile without warnings using Xcode 14.1's macOS 13.0 SDK.