chore(deps): bump dtolnay/rust-toolchain

Bumps the github-actions group with 1 update: [dtolnay/rust-toolchain](https://github.com/dtolnay/rust-toolchain).


Updates `dtolnay/rust-toolchain` from 02cb101ec7c40f2c49e1d9714d64511d8e1b74de to 7e38f4b43b4db5c8dd498af069a4f6196df1d067
- [Release notes](https://github.com/dtolnay/rust-toolchain/releases)
- [Commits](dtolnay/rust-toolchain@02cb101...7e38f4b)

---
updated-dependencies:
- dependency-name: dtolnay/rust-toolchain
  dependency-version: 7e38f4b43b4db5c8dd498af069a4f6196df1d067
  dependency-type: direct:production
  dependency-group: github-actions
...

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

Author: dependabot[bot]

.github/workflows/checker-scaling.yml

@@ -36,7 +36,7 @@ jobs:
     steps:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
       - name: Setup Rust
-        uses: dtolnay/rust-toolchain@02cb101ec7c40f2c49e1d9714d64511d8e1b74de # stable
+        uses: dtolnay/rust-toolchain@7e38f4b43b4db5c8dd498af069a4f6196df1d067 # stable
         with:
           toolchain: stable
       - name: Run allocation-scaling harness

.github/workflows/coverage.yml

@@ -48,7 +48,7 @@ jobs:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
 
       - name: Setup Rust
-        uses: dtolnay/rust-toolchain@02cb101ec7c40f2c49e1d9714d64511d8e1b74de # stable
+        uses: dtolnay/rust-toolchain@7e38f4b43b4db5c8dd498af069a4f6196df1d067 # stable
         with:
           toolchain: stable
           components: llvm-tools-preview

.github/workflows/stack-depth.yml

@@ -42,7 +42,7 @@ jobs:
     steps:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
       - name: Setup Rust
-        uses: dtolnay/rust-toolchain@02cb101ec7c40f2c49e1d9714d64511d8e1b74de # stable
+        uses: dtolnay/rust-toolchain@7e38f4b43b4db5c8dd498af069a4f6196df1d067 # stable
         with:
           toolchain: stable
       - name: Stack-depth regression test (#37 subtleties 1 & 3)