Upgrade the Rust toolchain to 1.99.1 (#61205)

## What changed

- Update the workspace, Bazel toolchain and lockfile, CI and release workflows, and Windows setup script from Rust `1.95.0` to `1.99.1`.
- Adapt Rust code to the updated toolchain and Clippy lints, including `try_update` for atomics, `as_chunks` for fixed-size slices, and targeted allowances for generated tonic services.
- Refresh the halfwidth sound mark rendering snapshot to use literal characters in debug output.

GitOrigin-RevId: 5852029f687436dc814c2bca68141ee1f4a67d49

.github/workflows/rust-ci-full.yml

@@ -25,7 +25,7 @@ jobs:
         with:
           persist-credentials: false
       - uses: ./.github/actions/setup-ci
-      - uses: dtolnay/rust-toolchain@e081816240890017053eacbb1bdf337761dc5582 # 1.95.0
+      - uses: dtolnay/rust-toolchain@d124f86f28ff42855784ff3319f48ac182c248f8 # 1.99.1
         with:
           components: rustfmt
       - name: cargo fmt
@@ -44,7 +44,7 @@ jobs:
         with:
           persist-credentials: false
       - uses: ./.github/actions/setup-ci
-      - uses: dtolnay/rust-toolchain@e081816240890017053eacbb1bdf337761dc5582 # 1.95.0
+      - uses: dtolnay/rust-toolchain@d124f86f28ff42855784ff3319f48ac182c248f8 # 1.99.1
       - uses: taiki-e/install-action@44c6d64aa62cd779e873306675c7a58e86d6d532 # v2.62.49
         with:
           tool: cargo-shear@1.11.2
@@ -246,7 +246,7 @@ jobs:
             sudo apt-get update -y
             sudo DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends build-essential pkg-config libcap-dev libasound2-dev
           fi
-      - uses: dtolnay/rust-toolchain@e081816240890017053eacbb1bdf337761dc5582 # 1.95.0
+      - uses: dtolnay/rust-toolchain@d124f86f28ff42855784ff3319f48ac182c248f8 # 1.99.1
         with:
           targets: ${{ matrix.target }}
           components: clippy