Bump dtolnay/rust-toolchain

Bumps [dtolnay/rust-toolchain](https://github.com/dtolnay/rust-toolchain) from 7e38f4b43b4db5c8dd498af069a4f6196df1d067 to 683b588c487a69d01f6c6ddf40f036ff682cc2c8.
- [Release notes](https://github.com/dtolnay/rust-toolchain/releases)
- [Commits](dtolnay/rust-toolchain@7e38f4b...683b588)

---
updated-dependencies:
- dependency-name: dtolnay/rust-toolchain
  dependency-version: 683b588c487a69d01f6c6ddf40f036ff682cc2c8
  dependency-type: direct:production
...

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

Author: dependabot[bot]

.github/workflows/build.yml

@@ -273,7 +273,7 @@ jobs:
         run: python -m pip install --upgrade -r build/test-requirements.txt
 
       - name: Rust Tool Chain setup
-        uses: dtolnay/rust-toolchain@7e38f4b43b4db5c8dd498af069a4f6196df1d067 # stable
+        uses: dtolnay/rust-toolchain@683b588c487a69d01f6c6ddf40f036ff682cc2c8 # stable
         with:
           toolchain: stable
 

.github/workflows/pr-check.yml

@@ -266,7 +266,7 @@ jobs:
         run: python -m pip install --upgrade -r build/test-requirements.txt
 
       - name: Rust Tool Chain setup
-        uses: dtolnay/rust-toolchain@7e38f4b43b4db5c8dd498af069a4f6196df1d067 # stable
+        uses: dtolnay/rust-toolchain@683b588c487a69d01f6c6ddf40f036ff682cc2c8 # stable
         with:
           toolchain: stable
 
@@ -550,7 +550,7 @@ jobs:
         shell: bash
 
       - name: Rust Tool Chain setup
-        uses: dtolnay/rust-toolchain@7e38f4b43b4db5c8dd498af069a4f6196df1d067 # stable
+        uses: dtolnay/rust-toolchain@683b588c487a69d01f6c6ddf40f036ff682cc2c8 # stable
         with:
           toolchain: stable