Bump amundsenmetadatalibrary from `7fab8ea` to `1b6904c` (#277)

Bumps [amundsenmetadatalibrary](https://github.com/lyft/amundsenmetadatalibrary) from `7fab8ea` to `1b6904c`.
- [Release notes](https://github.com/lyft/amundsenmetadatalibrary/releases)
- [Commits](https://github.com/lyft/amundsenmetadatalibrary/compare/7fab8eafdb1069d592e82dbc95207306a0da0073...1b6904c8227ab4afc113c8b0dec074bd2ab8b69e)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

amundsenmetadatalibrary @ 1b6904c8

-Subproject commit 7fab8eafdb1069d592e82dbc95207306a0da0073
+Subproject commit 1b6904c8227ab4afc113c8b0dec074bd2ab8b69e