e2e: pin cypress image

Even to digest, that we control it when the image changes.
Mac users can override the CYPRESS_DIGEST in the .env with:
CYPRESS_DIGEST=<sha of the arm image>

docker-compose.yml

@@ -157,7 +157,7 @@ services:
       - FUNCTION_ENABLE_INCOGNITO_MODE=true
 
   e2e:
-    image: cypress/included:13.13.0
+    image: cypress/included:cypress-13.13.0-node-20.15.1-chrome-126.0.6478.114-1-ff-128.0-edge-126.0.2592.61-1@${CYPRESS_DIGEST:-sha256:542b11720d448df6d7b12f85015f5adcb2b7f4618af4e77cd28b62766c0d3491}
     profiles: ['e2e']
     container_name: 'ecamp3-e2e'
     environment:

renovate.json

@@ -140,6 +140,14 @@
         "postgres"
       ],
       "allowedVersions": "15-alpine"
+    },
+    {
+      "matchDepNames": [
+        "cypress",
+        "cypress/included"
+      ],
+      "automerge": false,
+      "groupName": "cypress"
     }
   ],
   "customManagers": [