chore(deps): update actions/checkout action to v6

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This PR contains the following updates:

Package	Type	Update	Change
actions/checkout	action	major	v3 -> v6
actions/checkout	action	major	v4 -> v6

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Release Notes

actions/checkout (actions/checkout)

v6

Compare Source

• Fix tag handling: preserve annotations and explicit fetch-tags by @​ericsciple in #​2356

v5

Compare Source

• Port v6 cleanup to v5 by @​ericsciple in #​2301

v4

Compare Source

• Port v6 cleanup to v4 by @​ericsciple in #​2305

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Package	Line Rate	Health
github.com/cultureamp/example-go-buildkite-plugin/buildkite	0%	❌
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