use runtime-go 1.22.0 (#46)

diff --git a/core/rust1.34/Dockerfile b/core/rust1.34/Dockerfile
index 9ab8e57..9c3a116 100644
--- a/core/rust1.34/Dockerfile
+++ b/core/rust1.34/Dockerfile
@@ -26,7 +26,7 @@
 
 # or build it from a release
 FROM golang:1.20 AS builder_release
-ARG GO_PROXY_RELEASE_VERSION=1.20@1.21.0
+ARG GO_PROXY_RELEASE_VERSION=1.20@1.22.0
 RUN curl -sL \
   https://github.com/apache/openwhisk-runtime-go/archive/{$GO_PROXY_RELEASE_VERSION}.tar.gz\
   | tar xzf -\