Update chi/middleware to chi/v5/middleware (#17888)

Fix #17880


Co-authored-by: Lauris BH <lauris@nix.lv>

vendor/github.com/go-chi/chi/middleware/middleware.go

@@ -1,23 +0,0 @@
-package middleware
-
-import "net/http"
-
-// New will create a new middleware handler from a http.Handler.
-func New(h http.Handler) func(next http.Handler) http.Handler {
-	return func(next http.Handler) http.Handler {
-		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-			h.ServeHTTP(w, r)
-		})
-	}
-}
-
-// contextKey is a value for use with context.WithValue. It's used as
-// a pointer so it fits in an interface{} without allocation. This technique
-// for defining context keys was copied from Go 1.7's new use of context in net/http.
-type contextKey struct {
-	name string
-}
-
-func (k *contextKey) String() string {
-	return "chi/middleware context value " + k.name
-}