Remove accessUnixDomainSocket from plugin-security.policy

[cwperks]

Description

Removes this line from the policy file that was added in the previous PR to fix the build. This line may not be necessary outside of core libraries.

Check List

• New functionality includes testing
• New functionality has been documented
• New Roles/Permissions have a corresponding security dashboards plugin PR
• API changes companion pull request created
• Commits are signed per the DCO using --signoff

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.04%. Comparing base (37d259c) to head (356da9c).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5264      +/-   ##
==========================================
- Coverage   72.07%   72.04%   -0.03%     
==========================================
  Files         336      336              
  Lines       22614    22614              
  Branches     3554     3554              
==========================================
- Hits        16298    16293       -5     
- Misses       4543     4548       +5     
  Partials     1773     1773              

see 6 files with indirect coverage changes

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