Now that Go 1.22.6 is the minimum bootstrap toolchain (cf. CL 606156),
the slices package (introduced in Go 1.21) can be used in packages built
using the bootstrap toolchain.
For #64751
Change-Id: I0115213da4b1f0a1fa0ef7ad34456fbf52e00fae
Reviewed-on: https://go-review.googlesource.com/c/go/+/611095 Reviewed-by: Cherry Mui <cherryyz@google.com> Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Auto-Submit: Tobias Klauser <tobias.klauser@gmail.com>
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