Encode IPV6 Zone IDs (%) in ReactorServerHttpRequest

**Affects:** 6.0.7 (spring-web)

```java
@Test
void test() {
	UriComponentsBuilder
		.fromUri(URI.create("http://[0:0:0:0:0:0:0:1%0]:8082/graphql"))
		.build(true);
}
```

Fails with

```
Invalid encoded sequence "%0]"
```

The code doesn't handle the ipv6 address zone id / scope id correctly.
