Upgrade golang to 1.18

[andytinkham]

Signed-off-by: Andy Tinkham andy.tinkham@cyberark.com

Desired Outcome

Upgrade to Golang 1.18

Definition of Done

At least 1 todo must be completed in the sections below for the PR to be
merged.

Changelog

• The CHANGELOG has been updated, or
• This PR does not include user-facing changes and doesn't require a
  CHANGELOG update

Test coverage

• This PR includes new unit and integration tests to go with the code
  changes, or
• The changes in this PR do not require tests

Documentation

• Docs (e.g. READMEs) were updated in this PR
• A follow-up issue to update official docs has been filed here: insert issue ID
• This PR does not require updating any documentation

Behavior

• This PR changes product behavior and has been reviewed by a PO, or
• These changes are part of a larger initiative that will be reviewed later, or
• No behavior was changed with this PR

Security

• Security architect has reviewed the changes in this PR,
• These changes are part of a larger initiative with a separate security review, or
• There are no security aspects to these changes

[jtuttle]

Any reason to drop the -stretch here? It's going to update us from Debian 9 (Stretch) to Debian 11 (Bullseye) which may be a larger version upgrade than you intended.

[andytinkham]

I dropped stretch because it had more CVEs that Snyk was showing. I'm OK with the bigger update. Any concerns that the build wouldn't have caught?