release: 1.22 (envoyproxy#20847)

Signed-off-by: Matt Klein <mklein@lyft.com>

[1.21] CVE-2021-43826

Signed-off-by: Yan Avlasov <yavlasov@google.com>

[1.20] CVE-2022-23606

Signed-off-by: Yan Avlasov <yavlasov@google.com>

[1.19] CVE-2021-43826

tcp_proxy: Fix crash when using upstream tunneling if client disconnects
while connecting to the upstream

Signed-off-by: Yan Avlasov <yavlasov@google.com>

[1.18] CVE-2021-43826

tcp_proxy: Fix crash when using upstream tunneling if client disconnects
while connecting to the upstream

Signed-off-by: Yan Avlasov <yavlasov@google.com>

[1.18] CVE-2021-43826

tcp_proxy: Fix crash when using upstream tunneling if client disconnects
while connecting to the upstream

Signed-off-by: Yan Avlasov <yavlasov@google.com>

wasm: pass -Wno-invalid-offsetof when building V8. (envoyproxy#19514)

Signed-off-by: Piotr Sikora <piotrsikora@google.com>

release notes and version for 1.20.1 (envoyproxy#19140)

* release notes and version for 1.20.1

Signed-off-by: Greg Greenway <ggreenway@apple.com>

docs: fixes for release notes for 1.20 (envoyproxy#18403)

cleaning up release notes

Risk Level: n/a
Testing: n/a
Docs Changes: yes
Release Notes: no
Signed-off-by: Alyssa Wilk <alyssar@chromium.org>