delete duplicate app 2.js file and update github actions to v4

[codomposer]

Description

This PR addresses code maintenance issues by removing a duplicate file and modernizing GitHub Actions workflows.

Changes Made

1. Deleted Duplicate File

• Removed: src/assets/scripts/app 2.js
• Reason: Duplicate of app.js causing code maintenance confusion

2. Updated GitHub Actions to v4

Updated both workflow files to use the latest GitHub Actions versions:

.github/workflows/merge.yml

• Updated actions/checkout@v3 → actions/checkout@v4
• Updated actions/setup-node@v3 → actions/setup-node@v4
• Fixed deprecated ::set-output command → $GITHUB_OUTPUT

.github/workflows/release.yml

• Updated actions/checkout@v3 → actions/checkout@v4
• Updated actions/setup-node@v3 → actions/setup-node@v4
• Fixed deprecated ::set-output command → $GITHUB_OUTPUT
• Fixed missing with: keyword in Release step

Benefits

• ✅ Eliminates deprecation warnings in CI/CD pipeline
• ✅ Uses latest stable GitHub Actions versions
• ✅ Cleaner codebase without duplicate files
• ✅ Future-proof workflow configuration

Testing

• Workflows will be tested automatically when this PR is merged

Type of Change

• Bug fix (non-breaking change)
• Maintenance/cleanup
• CI/CD improvement

Contribution by Gittensor, learn more at https://gittensor.io/

[codomposer]

@puikinsh Could you please take a look this PR?