Remove GO_VERSION indirection

Author: tobio

.buildkite/hooks/pre-command

@@ -2,10 +2,6 @@
 
 set -euo pipefail
 
-echo "--- Golang version:"
-export GO_VERSION=1.22
-echo "${GO_VERSION}"
-
 RELEASE_VAULT_PATH=kv/ci-shared/terraform-providers
 
 if [[ "$BUILDKITE_PIPELINE_SLUG" == "terraform-provider-elasticstack-release" ]]; then

.buildkite/release.yml

@@ -1,7 +1,7 @@
 steps:
   - label: Release
     agents:
-      image: golang:${GO_VERSION}
+      image: golang:1.23.1
       cpu: "8"
       memory: "8G"
     command: