chore(deps): bump dtolnay/rust-toolchain from 1.96.0 to 1.120.0

Bumps [dtolnay/rust-toolchain](https://github.com/dtolnay/rust-toolchain) from 1.96.0 to 1.120.0.
- [Release notes](https://github.com/dtolnay/rust-toolchain/releases)
- [Commits](dtolnay/rust-toolchain@1.96.0...1.120.0)

---
updated-dependencies:
- dependency-name: dtolnay/rust-toolchain
  dependency-version: 1.120.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/better-harness-desktop.yml

@@ -25,7 +25,7 @@ jobs:
         with:
           node-version: '24'
           cache: npm
-      - uses: dtolnay/rust-toolchain@1.96.0
+      - uses: dtolnay/rust-toolchain@1.120.0
       - run: npm ci
       - run: npm run better-harness-desktop:test
       - run: npm run better-harness-desktop:pack