Upgrade versions of vendored libs

vendor/github.com/cockroachdb/pebble/read_state.go

@@ -40,7 +40,7 @@ func (s *readState) unref() {
 	}
 	s.current.Unref()
 	for _, mem := range s.memtables {
-		mem.readerUnref()
+		mem.readerUnref(true)
 	}
 
 	// The last reference to the readState was released. Check to see if there
@@ -58,7 +58,7 @@ func (s *readState) unrefLocked() {
 	}
 	s.current.UnrefLocked()
 	for _, mem := range s.memtables {
-		mem.readerUnref()
+		mem.readerUnrefLocked(true)
 	}
 
 	// NB: Unlike readState.unref(), we don't attempt to cleanup newly obsolete
@@ -78,8 +78,7 @@ func (d *DB) loadReadState() *readState {
 
 // updateReadStateLocked creates a new readState from the current version and
 // list of memtables. Requires DB.mu is held. If checker is not nil, it is
-// called after installing the new readState. If atomicFunc is not nil, it is
-// executed atomically with the transition to the new read state.
+// called after installing the new readState.
 func (d *DB) updateReadStateLocked(checker func(*DB) error) {
 	s := &readState{
 		db:        d,