Update go-build version to uptake golang version bumps

[mgleung]

Description

Related issues/PRs

Todos

• [ ] Tests
• [ ] Documentation
• [ ] Release note

Release Note

Update the go version used to build the binaries from 1.18.5 to 1.18.6

Reminder for the reviewer

Make sure that this PR has the correct labels and milestone set.

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Every PR needs one release-note-* label.

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• release-note-not-required: This PR has no user-facing changes.

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• cherry-pick-candidate: This PR should be cherry-picked to an earlier release. For bug fixes only.
• needs-operator-pr: This PR is related to install and requires a corresponding change to the operator.

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[caseydavenport]

Closing in favor of https://github.com/projectcalico/calico/pull/6858