Do not set the license URL in the POMs

[BoD]

Fix for #6240

See also cashapp/licensee#137

[svc-apollo-docs]

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[martinbonnin]

For the record, checked with different tools, users need to update their configuration:

cashapp/licensee

licensee {
  // Replace
  allowUrl("https://raw.githubusercontent.com/apollographql/apollo-kotlin/main/LICENSE")
  
  // With
  allow("MIT")
}

jk1/Gradle-License-Report

{
    "allowedLicenses": [
        {
            <!-- Replace -->
            "moduleLicense": "MIT License",
            <!-- With -->
            "moduleLicense": "MIT"
        }
    ]
}

With jk1/Gradle-License-Report, the report does not display the url anymore (which is somewhat expected):

Before:

After:

[martinbonnin]

I still think it makes sense. Let's give it the weekend until we merge this?