website/internal/history: updates for 1.20.5 and 1.19.10

Change-Id: I8bdf5d97fc0bd6877747d2f43bbc7d5c99442826
Reviewed-on: https://go-review.googlesource.com/c/website/+/501201
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: David Chase <drchase@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>

internal/history/release.go

@@ -14,6 +14,22 @@ import "html/template"
 //
 // The table is sorted by date, breaking ties with newer versions first.
 var Releases = []*Release{
+	{
+		Date: Date{2023, 6, 6}, Version: Version{1, 20, 5},
+		Security: &FixSummary{Quantifier: "four", Packages: []string{"cmd/go", "runtime"}},
+		Bug: &FixSummary{
+			Components: []template.HTML{"the compiler", "the <code>go</code> command", "the runtime"},
+			Packages:   []string{"crypto/rsa", "net", "os"},
+		},
+	},
+	{
+		Date: Date{2023, 6, 6}, Version: Version{1, 19, 10},
+		Security: &FixSummary{Quantifier: "four", Packages: []string{"cmd/go", "runtime"}},
+		Bug: &FixSummary{
+			Components: []template.HTML{"the compiler", "the <code>go</code> command", "the runtime"},
+			Packages:   []string{},
+		},
+	},
 	{
 		Date: Date{2023, 5, 2}, Version: Version{1, 20, 4},
 		Security: &FixSummary{Quantifier: "three", Packages: []string{"html/template"}},