Default to bash on all environments

.github/workflows/build.yml

@@ -20,7 +20,7 @@ jobs:
       fail-fast: false
     defaults:
       run:
-        shell: ${{ matrix.os == 'windows-latest' && 'cmd' || 'bash' }} -l {0} # Adjust shell based on OS
+        shell: bash
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -31,7 +31,7 @@ jobs:
       - name: Create venv and install dependencies
         run: |
           python -m venv .venv
-          .venv/Scripts/activate || source .venv/bin/activate
+          source .venv/bin/activate
           pip install -e .[dev]
       - name: Activate venv for later steps
         run: |