Bump firrtl from `5a05905` to `48da140` (#131)

Bumps [firrtl](https://github.com/freechipsproject/firrtl) from `5a05905` to `48da140`.
- [Release notes](https://github.com/freechipsproject/firrtl/releases)
- [Commits](https://github.com/freechipsproject/firrtl/compare/5a059054b686708ebb66054908dbf67fb3cd8220...48da140b23c010acd81f759a81d4694e7308caf2

)

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Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>