pkg/query: Replace remaining slices.Clone

[brancz]

Same as #3552

[alwaysmeticulous]

🤖 Meticulous replayed 50 user sessions and took 326 screenshots. Meticulous has not yet run on 2d6b35a of the main branch and so there was nothing to compare against.

If you recently setup Meticulous, this is expected. Meticulous will start reporting comparisons for new pull requests after the next commit to the main branch.

_{Last updated for commit 98bae34. This comment will update as new commits are pushed.}