refactor: replace golang.org/x/exp with stdlib (backport #1058)

[mergify]

Description

These experimental packages are now available in the Go standard library since Go 1.21 and Go 1.23:

golang.org/x/exp/slices -> slices (https://go.dev/doc/go1.21#slices)

Summary by CodeRabbit

• Chores
  • Updated dependency references to improve clarity without affecting functionality.
• Refactor
  • Shifted to a built-in library component for enhanced stability in core operations.

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This is an automatic backport of pull request #1058 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 48b7c38 has failed:

On branch mergify/bp/release/v1.3.x/pr-1058
Your branch is up to date with 'origin/release/v1.3.x'.

You are currently cherry-picking commit 48b7c38.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   v2/go.mod
	both modified:   v2/multitree.go

no changes added to commit (use "git add" and/or "git commit -a")

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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