net/http: invalid Cookie.Domain in case of setting cookie on IPv6

### Go version

go version go1.20.5 linux/amd64

### Output of `go env` in your module/workspace:

```shell
GO111MODULE="on"
GOARCH="amd64"
GOBIN=""
GOCACHE="/home/dmitry/.cache/go-build"
GOENV="/home/dmitry/.config/go/env"
GOEXE=""
GOEXPERIMENT=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOINSECURE=""
GOMODCACHE="/home/dmitry/go/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="linux"
GOPATH="/home/dmitry/go"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/usr/local/go"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/linux_amd64"
GOVCS=""
GOVERSION="go1.20.5"
GCCGO="gccgo"
GOAMD64="v1"
AR="ar"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD="/home/dmitry/go/src/***/go.mod"
GOWORK=""
CGO_CFLAGS="-O2 -g"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-O2 -g"
CGO_FFLAGS="-O2 -g"
CGO_LDFLAGS="-O2 -g"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build2985869622=/tmp/go-build -gno-record-gcc-switches"
```

### What did you do?

```
func(w http.ResponseWriter, r *http.Request) {
cookie := http.Cookie{
Name: "foo",
Value: "bar",
Path: "/",
Domain: "[fd7d:844d:3e17:f3ae::1]",
}

http.SetCookie(w, &cookie)
w.WriteHeader(http.StatusOK)
}
```

### What did you see happen?

in logs:
`net/http: invalid Cookie.Domain "[fd7d:844d:3e17:f3ae::1]"; dropping domain attribute`

in browser:
cookie is missing

### What did you expect to see?

i expect to see cookie which exists in browser like as in case of IPv4

i think trouble is in net/http/cookie.go:
```
// validCookieDomain reports whether v is a valid cookie domain-value.
func validCookieDomain(v string) bool {
if isCookieDomainName(v) {
return true
}
if net.ParseIP(v) != nil && !strings.Contains(v, ":") {
return true
}
return false
}

```