Bump amundsenmetadatalibrary from 40bf91c to 3b6c7b0 (#428)

Bumps [amundsenmetadatalibrary](https://github.com/lyft/amundsenmetadatalibrary) from `40bf91c` to `3b6c7b0`.
- [Release notes](https://github.com/lyft/amundsenmetadatalibrary/releases)
- [Commits](amundsen-io/amundsenmetadatalibrary@40bf91c...3b6c7b0)

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