Bundle winevt_c 0.11.5

It will fix SEGV possibility

Signed-off-by: Kentaro Hayashi <hayashi@clear-code.com>

Author: kenhys

fluent-package/Gemfile

@@ -112,7 +112,7 @@ gem "win32-event", "0.6.3", platforms: windows_platforms
 gem "win32-ipc", "0.7.0", platforms: windows_platforms
 # Use officially released version when PR was merged and released.
 #gem "win32-service", "2.3.2", platforms: windows_platforms
-gem "winevt_c", "0.11.4", platforms: windows_platforms
+gem "winevt_c", "0.11.5", platforms: windows_platforms
 gem "win32-eventlog", "0.6.7", platforms: windows_platforms
 gem "fluent-plugin-parser-winevt_xml", "0.2.8", platforms: windows_platforms
 gem "fluent-plugin-windows-eventlog", "0.9.2", platforms: windows_platforms