Use new grid-imaging-java11-ARM AMIgo image

The two services (`image-loader` & `cropper`) failed to deploy - although they use Java
(and so now need Java 11) they _don't_ use the `editorial-tools-focal-javaX-ARM-WITH-cdk-base`
Amigo image - they use `grid-imaging-ARM`:

#4329 (comment)

...so I've created a new https://amigo.gutools.co.uk/recipes/grid-imaging-java11-ARM
Amigo recipe.

riff-raff.yaml

@@ -93,7 +93,7 @@ deployments:
         ImagingAmiId:
           BuiltBy: amigo
           AmigoStage: PROD
-          Recipe: grid-imaging-ARM
+          Recipe: grid-imaging-java11-ARM
         ImgOpsAmiId:
           BuiltBy: amigo
           AmigoStage: PROD