chore: remove unused legacy grpc-web settings causing panic errors when shutting down gracefully

Signed-off-by: Alessandro Yuichi Okimoto <yuichijpn@gmail.com>

Author: cre8ivejp

go.mod

@@ -24,7 +24,6 @@ require (
 	github.com/googleapis/gax-go/v2 v2.15.0
 	github.com/grpc-ecosystem/grpc-gateway/v2 v2.27.2
 	github.com/hashicorp/vault/api v1.21.0
-	github.com/improbable-eng/grpc-web v0.15.0
 	github.com/jinzhu/copier v0.4.0
 	github.com/lib/pq v1.10.9
 	github.com/mna/redisc v1.4.0
@@ -85,7 +84,6 @@ require (
 	github.com/census-instrumentation/opencensus-proto v0.4.1 // indirect
 	github.com/cespare/xxhash/v2 v2.3.0 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
-	github.com/desertbit/timer v0.0.0-20180107155436-c41aec40b27f // indirect
 	github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f // indirect
 	github.com/felixge/httpsnoop v1.0.4 // indirect
 	github.com/go-logr/logr v1.4.3 // indirect
@@ -118,7 +116,6 @@ require (
 	github.com/prometheus/common v0.66.1 // indirect
 	github.com/prometheus/procfs v0.16.1 // indirect
 	github.com/prometheus/prometheus v0.35.0 // indirect
-	github.com/rs/cors v1.8.2 // indirect
 	github.com/ryanuber/go-glob v1.0.0 // indirect
 	github.com/zeebo/xxh3 v1.0.2 // indirect
 	go.opentelemetry.io/auto/sdk v1.1.0 // indirect
@@ -136,7 +133,6 @@ require (
 	golang.org/x/tools v0.36.0 // indirect
 	golang.org/x/xerrors v0.0.0-20240903120638-7835f813f4da // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
-	nhooyr.io/websocket v1.8.6 // indirect
 )
 
 replace k8s.io/code-generator => k8s.io/code-generator v0.0.0-20191003035328-700b1226c0bd