Change Buildkite git user name to 'Automattic Release Bot'

Co-authored-by: Gio Lodi <gio.lodi@automattic.com>

Author: oguzkocer

.buildkite/commands/configure-git-for-release-management.sh

@@ -4,7 +4,7 @@
 # Later on, we should be able to configure the agent instead.
 curl -L https://api.github.com/meta | jq -r '.ssh_keys | .[]' | sed -e 's/^/github.com /' >> ~/.ssh/known_hosts
 git config --global user.email "mobile+wpmobilebot@automattic.com"
-git config --global user.name "Buildkite"
+git config --global user.name "Automattic Release Bot"
 
 # Buildkite is currently using the https url to checkout. We need to override it to be able to use the deploy key.
 git remote set-url origin git@github.com:wordpress-mobile/WordPress-Android.git