Spring Configuration Metadata is incorrect for Credentials properties (spring.cloud.gcp.credentials)

Spring Configuration Metadata is incorrect for Credentials properties (spring.cloud.gcp.credentials).

In the spring-cloud-gcp-autoconfigure artifact, the **spring-configuration-metadata.json** file no longer defines the following properties:
- spring.cloud.gcp.credentials.encoded-key
- spring.cloud.gcp.credentials.location
- spring.cloud.gcp.credentials.scopes

Instead, the following property is defined:
- spring.cloud.gcp.credentials.default-scopes

The issue exists in Spring Cloud GCP versions 4, 5, and 6.
In version 3.8.18, the property definitions are correct.

v3.8.18:
```
{
"name": "spring.cloud.gcp.credentials.encoded-key",
"type": "java.lang.String",
"sourceType": "com.google.cloud.spring.core.Credentials"
},
{
"name": "spring.cloud.gcp.credentials.location",
"type": "org.springframework.core.io.Resource",
"sourceType": "com.google.cloud.spring.core.Credentials"
},
{
"name": "spring.cloud.gcp.credentials.scopes",
"type": "java.util.List",
"sourceType": "com.google.cloud.spring.core.Credentials"
}
```

v4.0.0:
```
{
"name": "spring.cloud.gcp.credentials.default-scopes",
"type": "java.lang.String[]",
"sourceType": "com.google.cloud.spring.core.Credentials"
}
```

Start in the spring-cloud-gcp-autoconfigure artifact by inspecting spring-configuration-metadata.json and comparing its Credentials entries with version 3.8.18. Trace how the metadata is produced for versions 4, 5, and 6. Done means encoded-key, location, and scopes are represented correctly, while default-scopes remains accurate.

Written by the indexing model from the issue text.