feat: add solc update template (#104)

assets/solc-update-template.md

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+# Solidity Version Upgrade Proposal
+
+- **Current Version:** [e.g., 0.8.20]
+- **Proposed Version:** [e.g., 0.8.25]
+
+## Benefits to the OP Stack
+
+Explain specific feature(s) in the new version that would benefit the OP Stack codebase, with a
+clear explanation of their potential impact and usefulness.
+
+## Summary of Changes
+
+Provide a comprehensive summary of all significant features, changes, and bug fixes introduced
+between the current version and the proposed upgrade.
+
+## Notable Features or Bug Fixes
+
+Highlight any potentially notable features or bug fixes that require special attention during the
+review process. Features should be considered "notable" if they add significant new functionality
+to Solidity. Bug fixes should be considered "notable" if they are classified at or above a "medium"
+by the Solidity team.
+
+## Changelog Links
+
+Provide links to the Solidity changelog for each version between the current version used in the
+codebase and the proposed new version.
+
+## Additional Notes
+
+Any other relevant information or considerations.