ci: move away from deprecated `actions-rs/toolchain` (#193)

Thanks for the suggestion @tl-eirik-albrigtsen

              this is deprecated;
```suggestion
      - name: Install Rust
        uses: dtolnay/rust-toolchain@stable

```

_Originally posted by @tl-eirik-albrigtsen in https://github.com/TrueLayer/reqwest-middleware/pull/192#discussion_r1804396867_

.github/workflows/ci.yml

@@ -13,11 +13,7 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v4
       - name: Install Rust
-        uses: actions-rs/toolchain@v1
+        uses: dtolnay/rust-toolchain@stable
-        with:
-          toolchain: stable
-          profile: minimal
-          override: true
       - uses: actions-rs/cargo@v1
         with:
           command: test
@@ -30,11 +26,7 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v4
       - name: Install Rust
-        uses: actions-rs/toolchain@v1
+        uses: dtolnay/rust-toolchain@stable
-        with:
-          toolchain: stable
-          profile: minimal
-          override: true
       - name: Install cargo-hack
         uses: taiki-e/install-action@cargo-hack
       - name: test
@@ -46,11 +38,7 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v4
       - name: Install Rust
-        uses: actions-rs/toolchain@v1
+        uses: dtolnay/rust-toolchain@stable
-        with:
-          toolchain: stable
-          profile: minimal
-          override: true
       - name: Install cargo-hack
         uses: taiki-e/install-action@cargo-hack
       - name: test
@@ -62,11 +50,7 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v4
       - name: Install Rust
-        uses: actions-rs/toolchain@v1
+        uses: dtolnay/rust-toolchain@stable
-        with:
-          toolchain: stable
-          profile: minimal
-          override: true
       - name: Install cargo-hack
         uses: taiki-e/install-action@cargo-hack
       # Old opentelemetry features group to improve performance
@@ -80,12 +64,7 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v4
       - name: Install Rust
-        uses: actions-rs/toolchain@v1
+        uses: dtolnay/rust-toolchain@stable
-        with:
-          toolchain: stable
-          profile: minimal
-          override: true
-          components: rustfmt
       - name: Check formatting
         uses: actions-rs/cargo@v1
         with:
@@ -99,12 +78,7 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v4
       - name: Install Rust
-        uses: actions-rs/toolchain@v1
+        uses: dtolnay/rust-toolchain@stable
-        with:
-          toolchain: stable
-          profile: minimal
-          override: true
-          components: clippy
       - name: Clippy check
         uses: actions-rs/cargo@v1
         with:
@@ -119,12 +93,7 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v4
       - name: Install Rust
-        uses: actions-rs/toolchain@v1
+        uses: dtolnay/rust-toolchain@stable
-        with:
-          toolchain: stable
-          profile: minimal
-          override: true
-          components: clippy
       - name: Install cargo-hack
         uses: taiki-e/install-action@cargo-hack
       - name: test
@@ -146,11 +115,7 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v4
       - name: Install Rust
-        uses: actions-rs/toolchain@v1
+        uses: dtolnay/rust-toolchain@stable
-        with:
-          toolchain: stable
-          profile: minimal
-          override: true
       - name: Check documentation
         env:
           RUSTDOCFLAGS: -D warnings
@@ -165,11 +130,8 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4
-      - uses: actions-rs/toolchain@v1
+      - name: Install Rust
-        with:
+        uses: dtolnay/rust-toolchain@stable
-          toolchain: stable
-          profile: minimal
-          override: true
       - uses: actions-rs/cargo@v1
         with:
           command: publish