[Snyk] Security upgrade registry.snld.ca/snyk/seanland-os from 22.04.0-20220913 to 22.04.0-20221018

As this is a private repository, Snyk-bot does not have access. Therefore, this PR has been created automatically, but appears to have been created by a real user.

Keeping your Docker base image up-to-date means you’ll benefit from security fixes in the latest version of your chosen image.

Changes included in this Merge Request

• custom.Dockerfile

We recommend upgrading to registry.snld.ca/snyk/seanland-os:22.04.0-20221018, as this image has only 9 known vulnerabilities. To do this, merge this pull request, then verify your application still works as expected.

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