release-1.7: Update golang to 1.18.9

[msau42]

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespaces from that line:

/kind api-change
/kind bug

/kind cleanup

/kind design
/kind documentation
/kind failing-test
/kind feature
/kind flake

What this PR does / why we need it:
Update golang to 1.18.9 to pickup fixes.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

Update golang to 1.18.9

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: msau42

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[msau42]

/assign @mattcary

[k8s-ci-robot]

@msau42: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-gcp-compute-persistent-disk-csi-driver-verify	8ae81dc	link	true	/test pull-gcp-compute-persistent-disk-csi-driver-verify

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[mattcary]

The verify failure is the 1.17->1.18 golang gofmt change (deep sigh). Force-merging to avoid spurious changes.