Allow higher gtk3/vte3 versions

[micwoj92]

topinambour/topinambour.gemspec

Line 16 in 437f5ff

s.add_runtime_dependency 'gtk3', '~> 3.2', '>= 3.2.6'

I run topinambour succesfully using version 4.1.2 of these bindings.

[barracuda156]

@micwoj92 Could you say why am I having this issue?

% /opt/local/libexec/ruby3.3/topinambour
Failed to execute child process “/usr/bin/zsh”: Failed to execve: No such file or directory

I get the X window starting, but no text input. Using macOS Sonoma, Ruby 3.3, gtk3 bindings v. 4.2.2.

[barracuda156]

@cedlemo Indeed, please update the port to use the current GTK3 bindings.