internal/history: document Go 1.17.4 and Go 1.16.11

Change-Id: Ie75a58e316eea0cc9777cadf72d50ff45f8ca0a7
Reviewed-on: https://go-review.googlesource.com/c/website/+/368734
Trust: Michael Knyszek <[email protected]>
Run-TryBot: Michael Knyszek <[email protected]>
TryBot-Result: Gopher Robot <[email protected]>
Reviewed-by: Dmitri Shuralyov <[email protected]>
Website-Publish: Dmitri Shuralyov <[email protected]>

Author: mknyszek

internal/history/release.go

@@ -14,6 +14,16 @@ import "golang.org/x/website/internal/backport/html/template"
 //
 // The table is sorted by date, breaking ties with newer versions first.
 var Releases = []*Release{
+	{
+		Date: Date{2021, 12, 2}, Version: Version{1, 17, 4},
+		Components: []template.HTML{"the compiler", "linker", "runtime"},
+		Packages:   []string{"go/types", "net/http", "time"},
+	},
+	{
+		Date: Date{2021, 12, 2}, Version: Version{1, 16, 11},
+		Components: []template.HTML{"the compiler", "runtime"},
+		Packages:   []string{"net/http", "net/http/httptest", "time"},
+	},
 	{
 		Date: Date{2021, 11, 4}, Version: Version{1, 17, 3},
 		CustomSummary: `includes security fixes to the <code>archive/zip</code> and <code>debug/macho</code> packages,