Update active branches for security scanner

[mboersma]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

Updates the weekly security scan GH action to target the currently supported branches.

Which issue(s) this PR fixes:

Refs #5798

Special notes for your reviewer:

TODOs:

• squashed commits
• includes documentation
• adds unit tests
• cherry-pick candidate

Release note:

NONE

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 46.94%. Comparing base (59de8c1) to head (53afe96).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5859   +/-   ##
=======================================
  Coverage   46.93%   46.94%           
=======================================
  Files         279      279           
  Lines       29687    29687           
=======================================
+ Hits        13934    13936    +2     
+ Misses      14940    14938    -2     
  Partials      813      813           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[alimaazamat]

/approve /lgtm

[marosset]

/lgtm
/approve

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: f40baf3373bf6faf3512c44375ab9aed4ce3c04a

[mboersma]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: alimaazamat, marosset, mboersma

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [mboersma]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment