internal/history: document Go 1.19.13 release

Change-Id: If7a237813eb8a619ae86a125dde16be3cbc283b1
Reviewed-on: https://go-review.googlesource.com/c/website/+/526175
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>

internal/history/release.go

@@ -30,6 +30,13 @@ var Releases = []*Release{
 			Packages:   []string{"crypto/tls", "go/types", "net/http", "path/filepath"},
 		},
 	},
+	{
+		Date: Date{2023, 9, 6}, Version: Version{1, 19, 13},
+		Bug: &FixSummary{
+			Components: []template.HTML{"the <code>go</code> command"},
+			Packages:   []string{"crypto/tls", "net/http"},
+		},
+	},
 	{
 		Date: Date{2023, 8, 8}, Version: Version{1, 21, 0},
 	},