Update pull_request_template.md

[0xmbcode]

Hello,

### Description
I noticed that the file path for the pull request template was incorrect, so I made the necessary adjustment. This pull request fixes the file path issue by changing it from CONTRIBUTIONS.md to CONTRIBUTING.md.

### Why
The incorrect file path was causing confusion and potentially preventing contributors from accessing the pull request template. This change ensures that the correct template is used when creating a new pull request.

### Testing Done
I have tested this change by creating a new pull request, and the correct template is now being applied without any issues.

### Additional Notes

• No additional dependencies or changes are required.
• This fix is straightforward and does not impact any other functionalities.

Thank you.

Checklist ✅

• I've read CONTRIBUTIONS.md document
• I've filled the contributions.json file

Issues this PR Resolves 🚀

• Link to the Issue:
• Link to the resolving PR on 3rd party repo:

Contributor social handles (Github / Twitter / Telegram) 🎙️

1. Example Contributor
   • Github: 0xmbcode

Contribution Description 📝

Describe your work in more details here

Additional Resources 🔗

Add any additional links you feel like will help with the review here (Contract Address, Deployer Address, Links to the code etc.)