[CRT] Disable security scans (for now)

[curtbushko]

Changes proposed in this PR:

• Disable security scans for now so that I can test CRT
• CRT only runs on merges so testing with a branch is not possible

How I've tested this PR:

How I expect reviewers to test this PR:

👀

Checklist:

• Tests added
• CHANGELOG entry added

  HashiCorp engineers only, community PRs should not add a changelog entry.
  Entries should use present tense (e.g. Add support for...)