go.{mod,sum}: require Go 1.18

[simonpasquier]

This is consistent with the version used by the OCP build toolchain and avoids potential issues with go mod tidy.

Required for #1764

• I added CHANGELOG entry for this change.
• No user facing changes, so no entry in CHANGELOG was needed.

[simonpasquier]

/skip

[jan--f]

/lgtm
/label docs-approved
/label px-approved
/label qe-approved
Adding labels for a simple version bump.

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jan--f, simonpasquier

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[openshift-ci-robot]

/retest-required

Remaining retests: 0 against base HEAD cf86818 and 2 for PR HEAD bbed315 in total

[simonpasquier]

/skip

[openshift-ci]

@simonpasquier: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/e2e-aws-single-node	bbed315	link	false	/test e2e-aws-single-node
ci/prow/versions	bbed315	link	false	/test versions

Full PR test history. Your PR dashboard.

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