fix(deps): update grafana/grafana-oss docker tag to v12

Author: renovate[bot]

src/grafana-cognito-auth.ts

@@ -363,7 +363,7 @@ export class GrafanaCognitoAuth extends constructs.Construct {
     this.containerDefinitionOpts = {
       image: ecs.ContainerImage.fromRegistry(
         // renovate: datasource=docker depName=grafana/grafana-oss
-        "grafana/grafana-oss:11.6.5@sha256:d552f949693c54d17c6f867ff6aeb128b021e54e923895dcf9cd6aa8176c0d74",
+        "grafana/grafana-oss:12.1.1@sha256:a1701c2180249361737a99a01bc770db39381640e4d631825d38ff4535efa47d",
       ),
       logging: ecs.LogDriver.awsLogs({
         streamPrefix: "ecs",