Bump chisel-testers from `4d110f7` to `d5fe488` (#155)

Bumps [chisel-testers](https://github.com/freechipsproject/chisel-testers) from `4d110f7` to `d5fe488`.
- [Release notes](https://github.com/freechipsproject/chisel-testers/releases)
- [Commits](https://github.com/freechipsproject/chisel-testers/compare/4d110f7dc09b0a93eef6e5d1f2951bfc1b82c5d7...d5fe488cc31d037445f2f46ce341a72aa253e7af

)

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