sources in the manifest JSON schema can have a specific data type

[yu-iskw]

Describe the bug

Some sources in the manifest JSON schema would be good to have a specific data type.
According to the JSON schema, some sources don't include their data types.

https://schemas.getdbt.com/dbt/manifest/v2.json

        "sources": {
          "type": "array",
          "items": {
            "type": "array"
          },
          "default": []
        },

Steps To Reproduce

Expected behavior

That can be an array of array of strings.

        "sources": {
          "type": "array",
          "items": {
            "type": "array",
            "items": {
              "type": "string"
            }
          },

Screenshots and log output

System information

Which database are you using dbt with?

• postgres
• redshift
• bigquery
• snowflake
• other (specify: ____________)

Additional context

Add any other context about the problem here.

[jtcohen6]

This seems reasonable enough to me. I can't think of a case where sources is something other than a list of strings. This change would also make the type of sources consistent with refs.

@gshank @nathaniel-may Do you see any reason to oppose this change? Or anything else we might be missing?

[gshank]

I don't see any reason to oppose this.

[yu-iskw]

@gshank I am happy to hear that. As I sent the PR #3967 , please take a look. Thanks!