buzz-agent-gm-rh: deploy v0.1.9 (finishes approved roll #1658/#1659)

Bump image and AGENT_REVISION to v0.1.9, the tag that carries the goal +
goal-check update (#1658) and the gm-promises / gm-daily / gm-status bake
(#1659, approved in RH #gm 68be7ee0). Also bumps AGENT_REVISION, which
#1614 left at v0.1.6 when the image went to v0.1.7.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: gm-rh (AI agent)

deploy/buzz-agents/gm-rh-deployment.yaml

@@ -32,7 +32,7 @@ spec:
       terminationGracePeriodSeconds: 300
       containers:
       - name: agent
-        image: ghcr.io/pulp/buzz-agent-gm-rh:v0.1.7
+        image: ghcr.io/pulp/buzz-agent-gm-rh:v0.1.9
         imagePullPolicy: IfNotPresent
         securityContext:
           allowPrivilegeEscalation: false
@@ -43,7 +43,7 @@ spec:
         - name: AGENT_SLUG
           value: gm-rh
         - name: AGENT_REVISION
-          value: v0.1.6
+          value: v0.1.9
         - name: AGENT_DEFINITION_REPO
           value: https://github.com/pulp/pulp-service.git
         - name: AGENT_DEFINITION_REF