Update mhs.yml

Author: sol

.github/workflows/mhs.yml

@@ -10,5 +10,5 @@ jobs:
       - uses: actions/checkout@v4
       - uses: sol/setup-MicroHs@nightly
       - run: mcabal -r install "--git=https://github.com/hspec/hspec --branch=micro-hs" --dir=hspec-core hspec-core
-      - run: mcabal -r install "--git=https://github.com/hspec/hspec --branch=micro-hs" hspec
+      - run: mcabal -r install "--git=https://github.com/hspec/hspec" hspec
       - run: mcabal -r build