chore(deps): update actions/setup-go action to v6

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This PR contains the following updates:

Package	Type	Update	Change
actions/setup-go	action	major	v3 -> v6
actions/setup-go	action	major	v5 -> v6

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Release Notes

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

v6

Compare Source

v5

Compare Source

v4

Compare Source

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[github-actions]

Package	Line Rate	Health
github.com/cultureamp/example-go-buildkite-plugin/buildkite	0%	❌
github.com/cultureamp/example-go-buildkite-plugin	0%	❌
github.com/cultureamp/example-go-buildkite-plugin/plugin	68%	➖
Summary	15% (13 / 87)	❌