txtar: use slices.Clone instead of copy

[Stavrospanakakis]

Use slices.Clone instead of copy now that x/tools uses Go >= 1.22.
Resolves an outstanding TODO.

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Patch Set 1:

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Patch Set 3: Code-Review+2

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Patch Set 3: -Commit-Queue

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Patch Set 3:

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Patch Set 4: Code-Review+2 Commit-Queue+1

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This PR is being closed because golang.org/cl/613835 has been merged.