SNOW-1293828 Updated security policy

[sfc-gh-mhofman]

Description

Security policy information

Checklist

• [ ] Code compiles correctly
• [ ] Code is formatted according to Coding Conventions
• [ ] Created tests which fail without the change (if possible)
• [ ] All tests passing (dotnet test)
• [x] Extended the README / documentation, if necessary
• [x] Provide JIRA issue id (if possible) or GitHub issue id in PR name

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 84.34%. Comparing base (0303514) to head (41d0c18). Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #904 +/- ## ========================================== - Coverage 84.35% 84.34% -0.01% ========================================== Files 89 89 Lines 9649 9683 +34 Branches 912 914 +2 ========================================== + Hits 8139 8167 +28 - Misses 1276 1282 +6 Partials 234 234 ```

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