Update unarm requirement from =1.6.5 to =1.6.7 (#89)

Updates the requirements on [unarm](https://github.com/AetiasHax/unarm) to permit the latest version.
- [Release notes](https://github.com/AetiasHax/unarm/releases)
- [Commits](AetiasHax/unarm@v1.6.5...v1.6.7)

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

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

Cargo.toml

@@ -20,7 +20,7 @@ m68k = ["m68000"]
 armv4t_emu = { version = "0.1.0", optional = true }
 m68000 = { version = "0.2.1", optional = true }
 rand = "0.8.5"
-unarm = { version = "=1.6.5", optional = true }
+unarm = { version = "=1.6.7", optional = true }
 emu6809 = { version = "0.1.2", optional = true }
 iz80 = { version = "0.4.1", optional = true }
 mos6502 = {version = "0.6.0", optional = true }