Bump emissary-ingress/emissary to latest release

Author: eks-distro-pr-bot

UPSTREAM_PROJECTS.yaml

@@ -93,7 +93,7 @@ projects:
     repos:
       - name: emissary
         versions:
-          - tag: v3.10.0
+          - tag: v4.0.0
             go_version: "1.24"
   - org: envoyproxy
     repos:

projects/emissary-ingress/emissary/GIT_TAG

@@ -1 +1 @@
-v3.10.0
+v4.0.0

projects/emissary-ingress/emissary/README.md

@@ -1,5 +1,5 @@
 ## **Emissary-ingress**
-![Version](https://img.shields.io/badge/version-v3.10.0-blue)
+![Version](https://img.shields.io/badge/version-v4.0.0-blue)
 ![Build Status](https://codebuild.us-west-2.amazonaws.com/badges?uuid=eyJlbmNyeXB0ZWREYXRhIjoid2Vla0ZUclhyN0dNN1ZLRnRoV3dBV241UDVVUUNmYUFyWVdDUWg3SUdqcThyblJvZ245cHN0cjFhUGNETDZhUkkySUNDZC9kdVFhemlpUjZGclRibUdnPSIsIml2UGFyYW1ldGVyU3BlYyI6IjRsempqaUZTNlB6TjF0bVQiLCJtYXRlcmlhbFNldFNlcmlhbCI6MX0%3D&branch=main)
 
 Official website: https://www.getambassador.io/docs/