Bump bigdecimal from 0.4.5 to 0.4.6

Bumps [bigdecimal](https://github.com/akubera/bigdecimal-rs) from 0.4.5 to 0.4.6.
- [Release notes](https://github.com/akubera/bigdecimal-rs/releases)
- [Commits](akubera/bigdecimal-rs@v0.4.5...v0.4.6)

---
updated-dependencies:
- dependency-name: bigdecimal
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>