Bump nushell version to 0.104 #37

Job	Run time
Build Nushell from `main`	2m 47s
Test Plugin: nu_plugin_nu_example	14s
Test Plugin: nu_plugin_node_example	7s
Test Plugin: nu_plugin_python_example	8s
Test Plugin: nu_plugin_custom_values	2m 9s
Test Plugin: nu_plugin_example	2m 7s
	7m 32s

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