Bump projects/signatures/sigma from `e597e13` to `a77d3ba`

[dependabot[bot]]

Bumps projects/signatures/sigma from e597e13 to a77d3ba.

Commits

• a77d3ba Merge PR #5708 from @​nasbench - Multiple updates and issue fixes
• 02f7843 Merge PR #5720 from @​nasbench - Add `Suspicious Speech Runtime Binary Child P...
• 6560a6c Merge PR #5711 from @​swachchhanda000 - Add PUA - AWS TruffleHog Execution
• 24f411b Merge PR #5706 from @​swachchhanda000 - update PFX File Creation
• bd21aec Merge PR #5604 from @​Liran017 - Add new winrs related rules
• 2d32b91 Merge PR #5661 from @​CheraghiMilad - Update `ASLR Disabled Via Sysctl or Dire...
• e40fc91 Merge PR #5600 from @​vl43den - Add `Syslog Clearing or Removal Via System Uti...
• d0c2317 Merge PR #5079 from @​mlakri - Add 2 new linux rules
• 875dee7 Merge PR #5634 from @​CheraghiMilad - Add `Kaspersky Endpoint Security Stopped...
• 6f9ccb3 Merge PR #5180 from @​frack113 - Add `Potential Executable Run Itself As Sacri...
• Additional commits viewable in compare view

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