chore(bazel): bump pointer to latest Go binary

[alexeagle]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @alexeagle, 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 updates the Go version used within the Bazel build system. It specifically bumps the Go binary version from "v1.20.0" to "v1.21.0" and refreshes all associated SHA256 checksums for various operating system and architecture combinations. This ensures that the build process utilizes the latest stable Go release, incorporating any new features, performance improvements, or security fixes.

Highlights

• Go Version Update: The Go version used for the Bazel build process has been updated from "v1.20.0" to "v1.21.0".
• Checksum Updates: The SHA256 checksums for the Go binaries across all supported platforms (darwin-amd64, darwin-arm64, linux-amd64, linux-arm64, linux-ppc64le, linux-s390x, windows-amd64.exe) have been updated to reflect the new Go version.

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[gemini-code-assist]

Code Review

This pull request updates the version of the container-structure-test Go binary from v1.20.0 to v1.21.0 and updates the corresponding SHA256 hashes. The change is straightforward. I've added one comment regarding an unused platform hash that could be removed to improve code maintainability.

[gemini-code-assist]

The hash for linux-ppc64le is updated, but this platform isn't defined in PLATFORMS in bazel/toolchains_repo.bzl and appears to be unused. To improve maintainability, consider removing this entry. If support for linux-ppc64le is intended, it should be added to the PLATFORMS dictionary.