chore(ci): pin some deps for MSRV job

Author: seanmonstar

.github/workflows/CI.yml

@@ -112,6 +112,11 @@ jobs:
 
       - uses: Swatinem/rust-cache@v2
 
+      - name: Pin some dependencies
+        run: |
+          cargo update -p tokio --precise 1.38.1
+          cargo update -p tokio-util --precise 0.7.11
+
       - name: Check
         run: cargo check --features full