Fix CI build

.github/workflows/ci.yml

@@ -11,24 +11,23 @@ concurrency:
   cancel-in-progress: true
 
 jobs:
-  msrv:
-    runs-on: ubuntu-latest
-    steps:
-    - uses: actions/checkout@v4
-    - uses: dtolnay/[email protected]
-    - run: cargo build --workspace
-
   test:
     runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        rust: ["1.72", stable]
     steps:
     - uses: actions/checkout@v4
-    - uses: dtolnay/rust-toolchain@stable
+    - uses: dtolnay/rust-toolchain@master
+      with:
+        toolchain: ${{matrix.rust}}
+    - run: cargo build --workspace
+    - run: cargo build --workspace --no-default-features
     - run: cargo test --workspace --all-targets --all-features
-    - run: cargo test --workspace --all-targets --no-default-features
-    - run: cargo test --workspace --all-targets --no-default-features --features serde
+      if: matrix.rust == 'stable'
     - run: cargo test --workspace --doc --all-features
-    - run: cargo test --workspace --doc --no-default-features
-    - run: cargo test --workspace --doc --no-default-features --features serde
+      if: matrix.rust == 'stable'
 
   clippy:
     runs-on: ubuntu-latest