fix: broken link CONTRIBUTING.md

[cypherpepe]

Description

Updated the link to the pull request template in CONTRIBUTING.md to point to the correct location:
https://github.com/ethereum-optimism/.github/blob/master/PULL_REQUEST_TEMPLATE.md.

Tests

No automated tests were added as this is a documentation update. Verified the updated link manually to ensure it works correctly.

Additional Context

This update ensures contributors are directed to the correct pull request template for consistency in submissions.

Metadata

• Fixes: None (no related issue linked)

[coderabbitai]

Walkthrough

The pull request modifies the CONTRIBUTING.md file by updating a link in the Pull Request process section. The change replaces a relative link to the Pull Request Template with an absolute URL pointing directly to the GitHub repository for the Ethereum Optimism project's template. This ensures contributors can easily access the template with a direct, external link.

Changes

File	Change Summary
CONTRIBUTING.md	Updated Pull Request Template link from relative path ./PULL_REQUEST_TEMPLATE.md to absolute GitHub URL https://github.com/ethereum-optimism/.github/blob/master/PULL_REQUEST_TEMPLATE.md

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📜 Recent review details

Configuration used: .coderabbit.yaml
Review profile: CHILL
Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 8cf4a06 and 544b345.

📒 Files selected for processing (1)

• CONTRIBUTING.md (1 hunks)

✅ Files skipped from review due to trivial changes (1)

• CONTRIBUTING.md

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