dev-go/go-sys: Update to version 0.15.0

Updates to version 0.15.0, required by go 1.22.3. Drops the
internal/unsafeheader package, which is no longer part of sys.

BUG=b/342019096
TEST=presubmit
RELEASE_NOTE=Updated dev-go/go-sys to v0.15.0.

Change-Id: I31e521670b15fab6a1811fad98c15a2ddeb2d31d
Reviewed-on: https://cos-review.googlesource.com/c/third_party/overlays/chromiumos-overlay/+/72317
Reviewed-by: Oleksandr Tymoshenko <ovt@google.com>
Tested-by: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
4 files changed