Update IFTVERSION => 0.4.3

[cpaniaguam]

• [x] https://github.com/WilhelmusLab/IceFloeTracker.jl/blob/0fde544bbf6b7cab857771c88b28e9ad1b39f33e/src/IceFloeTracker.jl#L71
• [x] https://github.com/WilhelmusLab/IceFloeTracker.jl/blob/0fde544bbf6b7cab857771c88b28e9ad1b39f33e/test/test-misc.jl#L3
• [x] https://github.com/WilhelmusLab/IceFloeTracker.jl/blob/0fde544bbf6b7cab857771c88b28e9ad1b39f33e/Project.toml#L4