bump Nushell to 0.91.0 in the CI

as per title

this MR also adds nu --version to the output of make show, to allow better debugging in the CI.

added 1 commit

• 1e6a7cc4 - show the Nushell version in the `make show` rule

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changed the description

added 3 commits

• b2eda009 - 1 commit from branch main
• 3bf94a6f - install Nushell 0.91.0 through Cargo
• 39ce55cd - show the Nushell version in the `make show` rule

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mentioned in merge request !49 (merged)

added 2 commits

• 08ff9b6f - bump Nushell to 0.91.0
• a1bf001f - show the Nushell version in the `make show` rule

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changed title from install Nushell 0.91.0 through Cargo to bump Nushell to 0.91.0 in the CI

enabled an automatic merge when the pipeline for a1bf001f succeeds

merged

mentioned in commit 770ce024