build: update github actions (major)

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/checkout	action	major	v3 → v6
actions/setup-go	action	major	v4 → v6
golangci/golangci-lint-action	action	major	v8 → v9

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Release Notes

actions/checkout (actions/checkout)

v6

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v5

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v4

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• url-helper.ts now leverages well-known environment variables by @​jww3 in #​1941
• Expand unit test coverage for isGhes by @​jww3 in #​1946

actions/setup-go (actions/setup-go)

v6

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v5

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golangci/golangci-lint-action (golangci/golangci-lint-action)

v9

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