chore(deps): Update quay.io/oauth2-proxy/oauth2-proxy Docker tag to v7.15.6

platform/crafty/deployment.yaml

@@ -130,7 +130,7 @@ spec:
         - name: oauth2-proxy
           # quay.io/oauth2-proxy/oauth2-proxy — same authenticator family as platform/oauth2-proxy, but
           # here in per-app REVERSE-PROXY mode (--upstream is the co-located Crafty UI, not static://202).
-          image: quay.io/oauth2-proxy/oauth2-proxy:v7.8.1
+          image: quay.io/oauth2-proxy/oauth2-proxy:v7.15.6
           imagePullPolicy: IfNotPresent
           args:
             - --http-address=0.0.0.0:4180