MM-49703: Bump Go version to 1.19 (#22107)

https://mattermost.atlassian.net/browse/MM-49703

Co-authored-by: Mattermost Build <build@mattermost.com>

build/Dockerfile.buildenv

@@ -1,3 +1,3 @@
-FROM golang:1.18.1@sha256:ee752bc53c628ff789bacefb714cff721701042ffa9eb736f7b2ed4e9f2bdab6
+FROM golang:1.19.5@sha256:bb9811fad43a7d6fd2173248d8331b2dcf5ac9af20976b1937ecd214c5b8c383
 
 RUN apt-get update && apt-get install -y make git apt-transport-https ca-certificates curl software-properties-common build-essential zip xmlsec1 jq