CI: In promotions, set the --go-version when building Grafana packages (#87912)

* Specify drone-version when building in promotions

* Specify drone-version when building in promotions

.drone.yml

@@ -3934,6 +3934,7 @@ steps:
 - commands:
   - 'dagger run --silent /src/grafana-build artifacts -a $${ARTIFACTS} --grafana-ref=$${GRAFANA_REF}
     --enterprise-ref=$${ENTERPRISE_REF} --grafana-repo=$${GRAFANA_REPO} --version=$${VERSION} '
+  - --go-version=1.22.3
   environment:
     _EXPERIMENTAL_DAGGER_CLOUD_TOKEN:
       from_secret: dagger_token
@@ -4921,6 +4922,6 @@ kind: secret
 name: gcr_credentials
 ---
 kind: signature
-hmac: 7397697ccc703dc375a0f90ba8a12fd978c2972f37fdffbdca1f72ff3991b339
+hmac: 29140f7ab2d57bd4c05b27863ab1227c722f793d9e1373e470c3e6b5681e7fb8
 
 ...

scripts/drone/rgm.star

@@ -371,6 +371,7 @@ def rgm_promotion_pipeline():
             "--enterprise-ref=$${ENTERPRISE_REF} " +
             "--grafana-repo=$${GRAFANA_REPO} " +
             "--version=$${VERSION} ",
+            "--go-version={}".format(golang_version),
         ],
         "environment": rgm_env_secrets(env),
         # The docker socket is a requirement for running dagger programs