all: make goimports happy

run goimports with -local flag. separates cue packages and other.
  $ goimports -w -local cuelang.org/go .

Change-Id: I3849b916fde18e4f62789cfe5220e12a84aaddbc
Reviewed-on: https://cue-review.googlesource.com/c/cue/+/4501
Reviewed-by: Marcel van Lohuizen <mpvl@golang.org>
diff --git a/pkg/list/math.go b/pkg/list/math.go
index d91adb5..c4f802a 100644
--- a/pkg/list/math.go
+++ b/pkg/list/math.go
@@ -17,8 +17,9 @@
 import (
 	"fmt"
 
-	"cuelang.org/go/internal"
 	"github.com/cockroachdb/apd/v2"
+
+	"cuelang.org/go/internal"
 )
 
 // Avg returns the average value of a non empty list xs.