Docs: Update SECURITY.md

[algonoah]

Summary

Test Plan

[codecov]

Codecov Report

Merging #4782 (0c3d541) into master (327e987) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4782      +/-   ##
==========================================
- Coverage   54.69%   54.68%   -0.01%     
==========================================
  Files         414      414              
  Lines       53548    53548              
==========================================
- Hits        29290    29285       -5     
- Misses      21834    21837       +3     
- Partials     2424     2426       +2     

Impacted Files	Coverage Δ
ledger/tracker.go	74.04% <0.00%> (-3.83%)	⬇️
catchup/peerSelector.go	98.95% <0.00%> (-1.05%)	⬇️
cmd/tealdbg/debugger.go	72.69% <0.00%> (-0.81%)	⬇️
catchup/service.go	68.88% <0.00%> (-0.50%)	⬇️
data/transactions/verify/txn.go	76.19% <0.00%> (ø)
ledger/testing/randomAccounts.go	56.61% <0.00%> (ø)
network/wsPeer.go	68.93% <0.00%> (+2.42%)	⬆️

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