Use the SPDX URL for the MIT License

[eygraber]

Description

The current URL (https://raw.githubusercontent.com/apollographql/apollo-kotlin/main/LICENSE) doesn't work with Licensee without explicitly allowing it, and it would be nice to use a standardized URL.

[BoD]

Thanks for reporting this! It appears that removing the URL from the POM and using the standard MIT spdx id will make Licensee happy

[BoD]

Fixed by #6247

[github-actions]

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