Fix install message for msrv

Author: jonhoo

.github/workflows/check.yml

@@ -84,7 +84,7 @@ jobs:
       - uses: actions/checkout@v3
         with:
           submodules: true
-      - name: Install ${{ matrix.toolchain }}
+      - name: Install ${{ matrix.msrv }}
         uses: dtolnay/rust-toolchain@master
         with:
           toolchain: ${{ matrix.msrv }}