[grafana-mcp] bump mcp image tag to 0.7.8

Signed-off-by: AvivGuiser <[email protected]>

Author: KyriosGN0

charts/grafana-mcp/Chart.yaml

@@ -1,7 +1,7 @@
 apiVersion: v2
 name: grafana-mcp
-version: 0.2.0
-appVersion: 0.7.6
+version: 0.2.1
+appVersion: 0.7.8
 kubeVersion: "^1.8.0-0"
 description: MCP server for Grafana.
 home: https://grafana.com