Update Mattermost to v5.39 (#132)

* Bump github.com/mattermost/mattermost-server/v5 in /dependabot

Bumps [github.com/mattermost/mattermost-server/v5](https://github.com/mattermost/mattermost-server) from 5.38.1 to 5.38.2.
- [Release notes](https://github.com/mattermost/mattermost-server/releases)
- [Changelog](https://github.com/mattermost/mattermost-server/blob/master/CHANGELOG.md)
- [Commits](https://github.com/mattermost/mattermost-server/compare/v5.38.1...v5.38.2)

---
updated-dependencies:
- dependency-name: github.com/mattermost/mattermost-server/v5
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

* Remove errant requires

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: parnic-sks <chris@straykitestudios.com>

.github/workflows/release.yml

@@ -9,7 +9,7 @@ env:
   DEBIAN_RELEASE: buster
   DOCKER_PWD: /root
   DOCKER_IMAGE: debian:${DEBIAN_RELEASE}
-  GO_VERSION: 1.15.5
+  GO_VERSION: 1.16.7
 
 jobs:
   build:

build.sh

@@ -11,7 +11,7 @@ MATTERMOST_RELEASE="${MATTERMOST_RELEASE:-v5.4.0}"
 NODE_KEY="${NODE_KEY:-9FD3B784BC1C6FC31A8A0A1C1655A0AB68576280}"
 NODE_RELEASE="${NODE_RELEASE:-10}"
 # golang version
-GO_VERSION="${GO_VERSION:-1.15.5}"
+GO_VERSION="${GO_VERSION:-1.16.7}"
 
 if [ "$(id -u)" -eq 0 ]; then # as root user
 	# create build user, if needed
@@ -33,9 +33,9 @@ if [ "$(id -u)" -eq 0 ]; then # as root user
 	apt-get update
 	# dependencies to setup repositories
 	apt-get install --quiet \
-		gnupg2 dirmngr apt-transport-https ca-certificates parallel
-	# receive missing key (retry on failure)
-	parallel --verbose --delay=30 --retries=5 "apt-key adv --keyserver 'ipv4.pool.sks-keyservers.net' --recv-keys '{}'" ::: "${NODE_KEY}"
+		gnupg2 dirmngr apt-transport-https ca-certificates curl
+	# receive missing key
+	curl -fsSL https://deb.nodesource.com/gpgkey/nodesource.gpg.key | apt-key add -
 	# add required additional repositories
 	printf 'deb-src http://deb.debian.org/debian %s main' "${DEBIAN_RELEASE}" \
 		> "/etc/apt/sources.list.d/${DEBIAN_RELEASE}-source.list"

dependabot/go.mod

@@ -1,3 +1,5 @@
 module github.com/SmartHoneybee/ubiquitous-memory/dependabot
 
-require github.com/mattermost/mattermost-server/v5 v5.36.0
+go 1.16
+
+require github.com/mattermost/mattermost-server/v5 v5.39.0