update workflows (#38)

- update checkout to v4
- replace deprecated actions-rs with dtolnay/rust-toolchain
- test with miri

.github/workflows/rust-build-and-test.yml

@@ -10,48 +10,39 @@ env:
   CARGO_TERM_COLOR: always
 
 jobs:
-  build-stable:
+  test-stable:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
-      - name: Install Rust
-        uses: actions-rs/toolchain@v1
-        with:
-          toolchain: stable
-          override: true
-          components: rustfmt, clippy
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Install Stable Rust Toolchain
+        uses: dtolnay/rust-toolchain@stable
       - name: Run cargo check
         run: |
           cargo check --verbose;
           cargo check --features small-vec --verbose;
-          cargo check --features thin-segments --verbose;
-          cargo check --features small-vec --features thin-segments --verbose;
       - name: Run tests
         run: |
           cargo test --verbose;
           cargo test --features small-vec --verbose;
-          cargo test --features thin-segments --verbose;
-          cargo test --features small-vec --features thin-segments --verbose;
-  build-nightly:
+  test-nightly:
       runs-on: ubuntu-latest
       steps:
-        - uses: actions/checkout@v2
-        - name: Install Rust
-          uses: actions-rs/toolchain@v1
+        - name: Checkout
+          uses: actions/checkout@v4
+        - name: Install Nightly Rust Toolchain
+          uses: dtolnay/rust-toolchain@nightly
           with:
-            toolchain: nightly
-            override: true
-            components: rustfmt, clippy, miri
+            components: miri
         - name: Run cargo check
           run: |
             cargo check --verbose;
             cargo check --features small-vec --verbose;
-            cargo check --features thin-segments --verbose;
-            cargo check --features small-vec --features thin-segments --verbose;
         - name: Run tests
           run: |
             cargo test --verbose;
-            cargo miri test --verbose;
             cargo test --features small-vec --verbose;
-            cargo test --features thin-segments --verbose;
-            cargo test --features small-vec --features thin-segments --verbose;
+        - name: Run tests under Miri
+          run: |
+            cargo miri test --verbose;
+            cargo miri test --features small-vec --verbose;