ci: use msrv resolver in msrv job

Author: seanmonstar

.github/workflows/CI.yml

@@ -88,17 +88,10 @@ jobs:
         with:
           toolchain: ${{ steps.msrv.outputs.version }}
 
-      - name: Pin some dependencies for MSRV
-        run: |
-          cargo update --package tokio --precise 1.38.1
-          cargo update --package tokio-util --precise 0.7.11
-          cargo update --package indexmap --precise 2.11.3
-          cargo update --package hashbrown --precise 0.15.0
-          cargo update --package once_cell --precise 1.20.3
-          cargo update --package tracing --precise 0.1.41
-          cargo update --package tracing-subscriber --precise 0.3.19
-          cargo update --package tracing-core --precise 0.1.33
-
+      - name: Resolve MSRV aware dependencies
+        run: cargo update
+        env:
+          CARGO_RESOLVER_INCOMPATIBLE_RUST_VERSIONS: fallback
 
       - run: cargo check -p h2