Build(deps): Bump third_party/sv2v from e9c01d2 to 12618d5

Bumps [third_party/sv2v](https://github.com/zachjs/sv2v) from `e9c01d2` to `12618d5`.
- [Release notes](https://github.com/zachjs/sv2v/releases)
- [Commits](zachjs/sv2v@e9c01d2...12618d5)

---
updated-dependencies:
- dependency-name: third_party/sv2v
  dependency-type: direct:production
...

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