Move MSRV checking to a separate step

.github/workflows/ci.yml

@@ -15,7 +15,6 @@ jobs:
     strategy:
       matrix:
         rust:
-          - "1.70" # minimum stable rust version
           - stable
           - beta
           - nightly
@@ -28,11 +27,25 @@ jobs:
           toolchain: ${{ matrix.rust }}
           components: rustfmt, clippy
 
+      # Make sure we test with recent deps
+      - run: cargo update
       - run: cargo build --all-features --all-targets
       - run: cargo test --all-features
       - run: cargo fmt --all -- --check
       - run: cargo clippy --all-features --all-targets -- -D warnings
 
+  msrv:
+    name: MSRV
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: dtolnay/rust-toolchain@v1
+        with:
+          toolchain: "1.70"
+
+      - run: cargo test --all-features
+
   docs:
     name: Documentation build
     runs-on: ubuntu-latest