Bump amundsenmetadatalibrary from `4f76585` to `9c21831` (#237)

Bumps [amundsenmetadatalibrary](https://github.com/lyft/amundsenmetadatalibrary) from `4f76585` to `9c21831`.
- [Release notes](https://github.com/lyft/amundsenmetadatalibrary/releases)
- [Commits](https://github.com/lyft/amundsenmetadatalibrary/compare/4f7658560a10936ce7a9d25497bc3915b9d3bdf1...9c21831dffcfd84d0ef00f3375057723d1aa737b)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

amundsenmetadatalibrary @ 9c21831d

-Subproject commit 4f7658560a10936ce7a9d25497bc3915b9d3bdf1
+Subproject commit 9c21831dffcfd84d0ef00f3375057723d1aa737b