ci: use msrv-aware cargo in msrv job (#2779)

Author: seanmonstar

.github/workflows/ci.yml

@@ -299,6 +299,12 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
 
+      - uses: dtolnay/rust-toolchain@stable
+      - name: Resolve MSRV aware dependencies
+        run: cargo update
+        env:
+          CARGO_RESOLVER_INCOMPATIBLE_RUST_VERSIONS: fallback
+
       - name: Get MSRV package metadata
         id: metadata
         run: cargo metadata --no-deps --format-version 1 | jq -r '"msrv=" + .packages[0].rust_version' >> $GITHUB_OUTPUT
@@ -308,18 +314,6 @@ jobs:
         with:
           toolchain: ${{ steps.metadata.outputs.msrv }}
 
-      - name: Fix log and tokio versions
-        run: |
-          cargo update
-          cargo update -p log --precise 0.4.18
-          cargo update -p tokio --precise 1.29.1
-          cargo update -p tokio-util --precise 0.7.11
-          cargo update -p idna_adapter --precise 1.1.0
-          cargo update -p hashbrown --precise 0.15.0
-          cargo update -p native-tls --precise 0.2.13
-          cargo update -p once_cell --precise 1.20.3
-          cargo update -p tracing-core --precise 0.1.33
-
       - uses: Swatinem/rust-cache@v2
 
       - name: Check