build: Upgrade to Go 1.18

[lenny-goodell]

Signed-off-by: Leonard Goodell [email protected]

If your build fails due to your commit message not passing the build checks, please review the guidelines here: https://github.com/edgexfoundry/go-mod-bootstrap/blob/main/.github/Contributing.md

PR Checklist

Please check if your PR fulfills the following requirements:

• I am not introducing a breaking change (if you are, flag in conventional commit message with BREAKING CHANGE: describing the break)
• I am not introducing a new dependency (add notes below if you are)
• I have added unit tests for the new feature or bug fix (if not, why?) N/A for build PR
• I have fully tested (add details below) this the new feature or bug fix (if not, why?)
• I have opened a PR for the related docs change (if not, why?) N/A for build PR

Testing Instructions

Run make test using Go 1.18

New Dependency Instructions (If applicable)

[codecov-commenter]

Codecov Report

Merging #357 (bd5c6a2) into main (18d6e92) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #357   +/-   ##
=======================================
  Coverage   60.37%   60.37%           
=======================================
  Files          22       22           
  Lines        1378     1378           
=======================================
  Hits          832      832           
  Misses        512      512           
  Partials       34       34           

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[ernestojeda]

LGTM