update to go1.20.8

go1.20.8 (released 2023-09-06) includes two security fixes to the html/template
package, as well as bug fixes to the compiler, the go command, the runtime,
and the crypto/tls, go/types, net/http, and path/filepath packages. See the
Go 1.20.8 milestone on our issue tracker for details:

https://github.com/golang/go/issues?q=milestone%3AGo1.20.8+label%3ACherryPickApproved

full diff: https://github.com/golang/go/compare/go1.20.7...go1.20.8

From the security mailing:

[security] Go 1.21.1 and Go 1.20.8 are released

Hello gophers,

We have just released Go versions 1.21.1 and 1.20.8, minor point releases.

These minor releases include 4 security fixes following the security policy:

- cmd/go: go.mod toolchain directive allows arbitrary execution
  The go.mod toolchain directive, introduced in Go 1.21, could be leveraged to
  execute scripts and binaries relative to the root of the module when the "go"
  command was executed within the module. This applies to modules downloaded using
  the "go" command from the module proxy, as well as modules downloaded directly
  using VCS software.

  Thanks to Juho Nurminen of Mattermost for reporting this issue.

  This is CVE-2023-39320 and Go issue https://go.dev/issue/62198.

- html/template: improper handling of HTML-like comments within script contexts
  The html/template package did not properly handle HMTL-like "<!--" and "-->"
  comment tokens, nor hashbang "#!" comment tokens, in <script> contexts. This may
  cause the template parser to improperly interpret the contents of <script>
  contexts, causing actions to be improperly escaped. This could be leveraged to
  perform an XSS attack.

  Thanks to Takeshi Kaneko (GMO Cybersecurity by Ierae, Inc.) for reporting this
  issue.

  This is CVE-2023-39318 and Go issue https://go.dev/issue/62196.

- html/template: improper handling of special tags within script contexts
  The html/template package did not apply the proper rules for handling occurrences
  of "<script", "<!--", and "</script" within JS literals in <script> contexts.
  This may cause the template parser to improperly consider script contexts to be
  terminated early, causing actions to be improperly escaped. This could be
  leveraged to perform an XSS attack.

  Thanks to Takeshi Kaneko (GMO Cybersecurity by Ierae, Inc.) for reporting this
  issue.

  This is CVE-2023-39319 and Go issue https://go.dev/issue/62197.

- crypto/tls: panic when processing post-handshake message on QUIC connections
  Processing an incomplete post-handshake message for a QUIC connection caused a panic.

  Thanks to Marten Seemann for reporting this issue.

  This is CVE-2023-39321 and CVE-2023-39322 and Go issue https://go.dev/issue/62266.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

Dockerfile

@@ -1,6 +1,6 @@
 # syntax=docker/dockerfile:1
 
-ARG GO_VERSION=1.20.7
+ARG GO_VERSION=1.20.8
 ARG XX_VERSION=1.2.1
 
 ARG DOCKER_VERSION=24.0.2

hack/dockerfiles/docs.Dockerfile

@@ -1,6 +1,6 @@
 # syntax=docker/dockerfile:1
 
-ARG GO_VERSION=1.20.7
+ARG GO_VERSION=1.20.8
 ARG FORMATS=md,yaml
 
 FROM golang:${GO_VERSION}-alpine AS docsgen

hack/dockerfiles/generated-files.Dockerfile

@@ -5,7 +5,7 @@
 # Copyright The Buildx Authors.
 # Licensed under the Apache License, Version 2.0
 
-ARG GO_VERSION="1.20.7"
+ARG GO_VERSION="1.20.8"
 ARG PROTOC_VERSION="3.11.4"
 
 # protoc is dynamically linked to glibc so can't use alpine base

hack/dockerfiles/lint.Dockerfile

@@ -1,6 +1,6 @@
 # syntax=docker/dockerfile:1
 
-ARG GO_VERSION=1.20.7
+ARG GO_VERSION=1.20.8
 
 FROM golang:${GO_VERSION}-alpine
 RUN apk add --no-cache git gcc musl-dev

hack/dockerfiles/vendor.Dockerfile

@@ -1,6 +1,6 @@
 # syntax=docker/dockerfile:1
 
-ARG GO_VERSION=1.20.7
+ARG GO_VERSION=1.20.8
 ARG MODOUTDATED_VERSION=v0.8.0
 
 FROM golang:${GO_VERSION}-alpine AS base