fix: Add bash shell specification for Windows release build

The Build Release Artifacts job was failing on Windows with PowerShell syntax errors
when trying to execute bash if-statement syntax. Adding 'shell: bash' ensures the
script runs in bash on all platforms including Windows runners.

Error fixed:
- ParserError: Missing '(' after 'if' in if statement
- Windows runners default to PowerShell without explicit shell specification
- Bash syntax requires explicit shell: bash on Windows GitHub Actions runners

Author: doublegate

.github/workflows/master-pipeline.yml

@@ -522,6 +522,7 @@ jobs:
           save-if: ${{ github.ref == 'refs/heads/main' }}
 
       - name: Build release binary
+        shell: bash
         run: |
           if [ "${{ matrix.cross }}" = "true" ]; then
             cross build --release --target ${{ matrix.target }} --bin rustirc