Update net-contour nightly (#15471)

bumping knative.dev/net-contour 0d9e460...a52b769:
  > a52b769 upgrade to latest dependencies (# 1125)

Signed-off-by: Knative Automation <automation@knative.team>

third_party/contour-latest/net-contour.yaml

@@ -8,7 +8,7 @@ metadata:
     networking.knative.dev/ingress-provider: contour
     app.kubernetes.io/component: net-contour
     app.kubernetes.io/name: knative-serving
-    app.kubernetes.io/version: "20240813-0d9e4609"
+    app.kubernetes.io/version: "20240815-a52b7694"
     serving.knative.dev/controller: "true"
 rules:
   - apiGroups: ["projectcontour.io"]
@@ -38,7 +38,7 @@ metadata:
     networking.knative.dev/ingress-provider: contour
     app.kubernetes.io/component: net-contour
     app.kubernetes.io/name: knative-serving
-    app.kubernetes.io/version: "20240813-0d9e4609"
+    app.kubernetes.io/version: "20240815-a52b7694"
 data:
   _example: |
     ################################
@@ -111,7 +111,7 @@ metadata:
     networking.knative.dev/ingress-provider: contour
     app.kubernetes.io/component: net-contour
     app.kubernetes.io/name: knative-serving
-    app.kubernetes.io/version: "20240813-0d9e4609"
+    app.kubernetes.io/version: "20240815-a52b7694"
 spec:
   replicas: 1
   selector:
@@ -123,14 +123,14 @@ spec:
         app: net-contour-controller
         app.kubernetes.io/component: net-contour
         app.kubernetes.io/name: knative-serving
-        app.kubernetes.io/version: "20240813-0d9e4609"
+        app.kubernetes.io/version: "20240815-a52b7694"
     spec:
       serviceAccountName: controller
       containers:
         - name: controller
           # This is the Go import path for the binary that is containerized
           # and substituted here.
-          image: gcr.io/knative-nightly/knative.dev/net-contour/cmd/controller@sha256:dda6161ff33f80522599f3ce0a10dc7b5e45f3337b7b2646468c80d36dd547cd
+          image: gcr.io/knative-nightly/knative.dev/net-contour/cmd/controller@sha256:cc485d432ef1876485f71349ed3aa886899cd76f4dbf45ca0f671fd7dcf941d8
           resources:
             requests:
               cpu: 40m
@@ -174,7 +174,7 @@ metadata:
     networking.knative.dev/ingress-provider: contour
     app.kubernetes.io/component: net-contour
     app.kubernetes.io/name: knative-serving
-    app.kubernetes.io/version: "20240813-0d9e4609"
+    app.kubernetes.io/version: "20240815-a52b7694"
 spec:
   delegations:
     - secretName: routing-serving-certs