Update Go and deps, address errorlint issues

[andrewkroh]

Update to Go 1.18.

Update golangci-lint.

Update dependencies with 'go get -u -t ./...'

Fix warnings from errorlint.

Bind http test server to localhost instead of 0.0.0.0.

[elasticmachine]

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• Start Time: 2022-07-07T11:14:45.445+0000

• Duration: 5 min 24 sec

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Test	Results
Failed	0
Passed	6
Skipped	0
Total	6

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[ShourieG]

LGTM