chore: Bump Go version to 1.24

[rm3l]

Summary by Sourcery

Upgrade Go toolchain to 1.24, update CI linting action, and suppress unhandled error warnings.

Enhancements:

• Ignore fmt.Fprintln error return to satisfy linter

Build:

• Bump module Go version to 1.24

CI:

• Update golangci-lint GitHub Action to v8

Chores:

• Regenerate go.sum and update .tool-versions

[sourcery-ai]

Reviewer's Guide

This PR upgrades the project’s Go version to 1.24, bumps the golangci-lint action to v8, adjusts error handling in the GitHub issue finder, and refreshes related version files.

File-Level Changes

Change	Details	Files
Ignore fmt.Fprintln return values when writing stderr	Replaced direct fmt.Fprintln call with assignment to blank identifiers	pkg/issue/github.go
Upgrade golangci-lint GitHub Action	Changed action reference from v6.5.2 to v8	.github/workflows/lint.yml
Bump Go version in module definition	Updated go directive from 1.20 to 1.24	go.mod
Refresh tooling and checksum files	Regenerated entries in .tool-versions Updated go.sum with new module checksums	.tool-versions go.sum

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[sourcery-ai]

Hey @rm3l - I've reviewed your changes - here's some feedback:

• Double-check that upgrading golangci-lint-action to v8 still supports the version input syntax used here, as v8 may have breaking config changes.
• Since you’re intentionally ignoring the error returned by fmt.Fprintln, consider adding a brief comment explaining why it’s safe to discard it rather than silently swallowing failures.

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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