vendor: Mega update all dependencies

GitHub-Pull-Request: https://github.com/syncthing/syncthing/pull/4080

vendor/github.com/calmh/du/diskusage_windows_test.go

@@ -1,27 +0,0 @@
-package du
-
-import "testing"
-
-func TestDiskUsage(t *testing.T) {
-	cases := []struct {
-		path string
-		ok   bool
-	}{
-		{"c:\\", true},
-		{"c:\\windows", true},
-		{"c:\\aux", false},
-		{"c:\\does-not-exist-09sadkjhdsa98234bj23hgasd98", false},
-	}
-	for _, tc := range cases {
-		res, err := Get(tc.path)
-		if tc.ok {
-			if err != nil {
-				t.Errorf("Unexpected error Get(%q) => %v", tc.path, err)
-			} else if res.TotalBytes == 0 || res.AvailBytes == 0 || res.FreeBytes == 0 {
-				t.Errorf("Suspicious result Get(%q) => %v", tc.path, res)
-			}
-		} else if err == nil {
-			t.Errorf("Unexpected nil error in Get(%q)", tc.path)
-		}
-	}
-}