fix: handle arm64/aarch64 difference before and after 1.3

[murfffi]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @murfffi, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a crucial fix for handling arm64 architecture naming conventions that changed around version 1.3. It ensures that older versions correctly map arm64 to aarch64 while newer versions use arm64 directly. The changes also include version string normalization and a substantial expansion of test cases to thoroughly validate the new logic across different versions and architectures, alongside minor Go module updates.

Highlights

• Platform Architecture Handling: Implemented logic to correctly map arm64 to aarch64 only for versions prior to v1.3.0, addressing a change in how these architectures are referenced in different versions. For versions v1.3.0 and above, arm64 is now used directly.
• Version Normalization: Added a step to normalize version strings by prepending 'v' if a version is semver-valid without it, ensuring consistent version comparisons using the golang.org/x/mod/semver package.
• Expanded Test Coverage: Significantly enhanced the download tests to cover various versions and architectures, including arm64, to thoroughly validate the new architecture handling logic across different version scenarios.
• Dependency Updates: Updated the Go module to go 1.24.7 and introduced golang.org/x/mod as a new dependency for semantic versioning utilities.

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[gemini-code-assist]

Code Review

This pull request addresses an issue with architecture name differences for arm64 in DuckDB versions prior to v1.3.0 by conditionally changing arm64 to aarch64. It also improves version string handling by automatically prepending v where appropriate. The test suite has been significantly expanded to cover various versions and architectures, which is a great improvement. My review includes a couple of suggestions to enhance code maintainability by replacing a magic string with a constant and by refactoring the new test to use a table-driven approach for better readability.