Bump chisel3 from 1dcac6a to 9d964e9 (#436)

Bumps [chisel3](https://github.com/chipsalliance/chisel3) from `1dcac6a` to `9d964e9`.
- [Release notes](https://github.com/chipsalliance/chisel3/releases)
- [Commits](chipsalliance/chisel@1dcac6a...9d964e9)

---
updated-dependencies:
- dependency-name: chisel3
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>