vendor: update dependencies with github.com/kardianos/govendor

vendor/github.com/aristanetworks/goarista/monotime/nanotime.go

@@ -6,6 +6,7 @@
 package monotime
 
 import (
+	"time"
 	_ "unsafe" // required to use //go:linkname
 )
 
@@ -22,3 +23,9 @@ func nanotime() int64
 func Now() uint64 {
 	return uint64(nanotime())
 }
+
+// Since returns the amount of time that has elapsed since t. t should be
+// the result of a call to Now() on the same machine.
+func Since(t uint64) time.Duration {
+	return time.Duration(Now() - t)
+}