switch to maintained rust toolchain gh action

Signed-off-by: reubenmiller <[email protected]>

Author: reubenmiller

Diff for: .github/workflows/nightly.yml

@@ -20,7 +20,7 @@ jobs:
         with:
           ref: "${{ github.event.inputs.rev }}"
       - name: Install latest Rust
-        uses: actions-rs/toolchain@v1
+        uses: dtolnay/rust-toolchain@master
         with:
           toolchain: nightly
       - name: Install cargo udeps
@@ -36,7 +36,7 @@ jobs:
         with:
           ref: "${{ github.event.inputs.rev }}"
       - name: Install latest Rust
-        uses: actions-rs/toolchain@v1
+        uses: dtolnay/rust-toolchain@master
         with:
           toolchain: nightly
       - name: Install cargo audit