Remove msrv package pin that shouldn't have been re-added

Author: akern40

.github/workflows/ci.yml

@@ -26,10 +26,6 @@ jobs:
       - uses: dtolnay/rust-toolchain@master
         with:
           toolchain: ${{ matrix.rust }}
-      - name: Pin versions for MSRV
-        if: "${{ matrix.rust == '1.65.0' }}"
-        run: |
-          cargo update -p regex --precise 1.8.4
       - name: Build
         run: cargo build --verbose
       - name: Run tests