Fix Windows build: use bash shell for version update step

Windows runners use PowerShell by default, which doesn't support
bash variable syntax. Adding 'shell: bash' fixes this.

Co-authored-by: openhands <[email protected]>

Author: openhands-agent

.github/workflows/release.yml

@@ -75,6 +75,7 @@ jobs:
           cache: "npm"
 
       - name: Update version from tag
+        shell: bash
         run: |
           # Extract version from tag (remove 'v' prefix if present)
           VERSION="${{ github.ref_name }}"