Bump Gradle to 9.0.0

[martinbonnin]

No description provided.

[apollo-librarian]

❌ Docs preview failed

The preview failed to build.

Build ID: 2e421d5d36f8badc00a64952
Build Logs: View logs

Errors

General: Error parsing (developer-tools)/apollo-operator/_sidebar.yaml: [
{
"code": "unrecognized_keys",
"keys": [
"children"
],
"path": [
"items",
1,
"children",
0
],
"message": "Unrecognized key(s) in object: 'children'"
},
{
"code": "unrecognized_keys",
"keys": [
"children"
],
"path": [
"items",
3
],
"message": "Unrecognized key(s) in object: 'children'"
}
]

[BoD]

🎉