chore(deps): bump dtolnay/rust-toolchain (#64)

Bumps [dtolnay/rust-toolchain](https://github.com/dtolnay/rust-toolchain) from 67ef31d5b988238dd797d409d6f9574278e20537 to fa04a1451ff1842e2626ccb99004d0195b455a88.
- [Release notes](https://github.com/dtolnay/rust-toolchain/releases)
- [Commits](dtolnay/rust-toolchain@67ef31d...fa04a14)

---
updated-dependencies:
- dependency-name: dtolnay/rust-toolchain
  dependency-version: fa04a1451ff1842e2626ccb99004d0195b455a88
  dependency-type: direct:production
...

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

Author: dependabot[bot]

.github/workflows/rust.yml

@@ -20,7 +20,7 @@ jobs:
       - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
       # dtolnay/rust-toolchain selects the toolchain from the @ref (a branch); pinned to a
       # SHA we must name the toolchain explicitly via `toolchain:`.
-      - uses: dtolnay/rust-toolchain@67ef31d5b988238dd797d409d6f9574278e20537 # master
+      - uses: dtolnay/rust-toolchain@fa04a1451ff1842e2626ccb99004d0195b455a88 # master
         with:
           toolchain: stable
       - uses: Swatinem/rust-cache@e18b497796c12c097a38f9edb9d0641fb99eee32 # v2
@@ -30,13 +30,13 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
-      - uses: dtolnay/rust-toolchain@67ef31d5b988238dd797d409d6f9574278e20537 # master
+      - uses: dtolnay/rust-toolchain@fa04a1451ff1842e2626ccb99004d0195b455a88 # master
         with:
           toolchain: stable
           components: clippy
       # Nightly is only needed for rustfmt's imports_granularity option (matches the
       # reference repo's `cargo +nightly fmt` formatting contract).
-      - uses: dtolnay/rust-toolchain@67ef31d5b988238dd797d409d6f9574278e20537 # master
+      - uses: dtolnay/rust-toolchain@fa04a1451ff1842e2626ccb99004d0195b455a88 # master
         with:
           toolchain: nightly
           components: rustfmt
@@ -52,7 +52,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
-      - uses: dtolnay/rust-toolchain@67ef31d5b988238dd797d409d6f9574278e20537 # master
+      - uses: dtolnay/rust-toolchain@fa04a1451ff1842e2626ccb99004d0195b455a88 # master
         with:
           toolchain: stable
       - uses: Swatinem/rust-cache@e18b497796c12c097a38f9edb9d0641fb99eee32 # v2