Adding H2C causes websocket to fail to connect

[WangJincheng4869]

Describe the bug

<spring-cloud.version>2023.0.5</spring-cloud.version>

Sample

    @Bean
    public HttpClientCustomizer httpClientCustomizer() {
        return httpClient -> httpClient.protocol(
                HttpProtocol.H2,
                HttpProtocol.H2C,
                HttpProtocol.HTTP11
        );
    }