gopls/internal/server: fix build following semantic merge conflict

Fix the gopls build, which was broken by a semantic merge conflict with
CL 548675 (the slices package was made obsolete after updating to Go
1.23.1).

Change-Id: Ic8b82598b66c560298dd9b8f968a1087e12320f3
Reviewed-on: https://go-review.googlesource.com/c/tools/+/611839
Reviewed-by: Hongxiang Jiang <hxjiang@golang.org>
Reviewed-by: Alan Donovan <adonovan@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Tim King <taking@google.com>
diff --git a/gopls/internal/server/command.go b/gopls/internal/server/command.go
index 85e5447..352008a 100644
--- a/gopls/internal/server/command.go
+++ b/gopls/internal/server/command.go
@@ -17,6 +17,7 @@
 	"regexp"
 	"runtime"
 	"runtime/pprof"
+	"slices"
 	"sort"
 	"strings"
 	"sync"
@@ -35,7 +36,6 @@
 	"golang.org/x/tools/gopls/internal/protocol/command"
 	"golang.org/x/tools/gopls/internal/settings"
 	"golang.org/x/tools/gopls/internal/util/bug"
-	"golang.org/x/tools/gopls/internal/util/slices"
 	"golang.org/x/tools/gopls/internal/vulncheck"
 	"golang.org/x/tools/gopls/internal/vulncheck/scan"
 	"golang.org/x/tools/internal/diff"