Fix various memory leaks under Windows

CHANGELOG.next.asciidoc

@@ -71,12 +71,14 @@ https://github.com/elastic/beats/compare/v7.0.0-alpha2...master[Check the HEAD d
 - Fix flaky service_integration_windows_test test by introducing a confidence factor and enriching the error message with more service details. {issue}8880[8880] and {issue}7977[7977]
 - Replace wmi queries with win32 api calls as they were consuming CPU resources {issue}3249[3249] and {issue}11840[11840]
 - Fix queue.spool.write.flush.events config type. {pull}12080[12080]
+- Fixed a memory leak when using the add_process_metadata processor under Windows. {pull}12100[12100]
 
 *Auditbeat*
 
 - Package dataset: dlopen versioned librpm shared objects. {pull}11565[11565]
 - Package dataset: Nullify Librpm's rpmsqEnable. {pull}11628[11628]
 - Package dataset: Log error when Homebrew is not installed. {pull}11667[11667]
+- Process dataset: Fixed a memory leak under Windows. {pull}12100[12100]
 - Login dataset: Fix re-read of utmp files. {pull}12028[12028]
 
 *Filebeat*
@@ -115,6 +117,7 @@ https://github.com/elastic/beats/compare/v7.0.0-alpha2...master[Check the HEAD d
 
 - Prevent duplicate packet loss error messages in HTTP events. {pull}10709[10709]
 - Avoid reporting unknown MongoDB opcodes more than once. {pull}10878[10878]
+- Fixed a memory leak when using process monitoring under Windows. {pull}12100[12100]
 
 *Winlogbeat*
 

NOTICE.txt

@@ -715,15 +715,15 @@ Apache License 2.0
 
 --------------------------------------------------------------------
 Dependency: github.com/elastic/go-sysinfo
-Revision: ab4f04edfc3d6b3864f5f06a068ddab9ad79774f
+Revision: 9a4be54a53be4c48b44d351d52fb425a5e274be5
 License type (autodetected): Apache-2.0
 ./vendor/github.com/elastic/go-sysinfo/LICENSE.txt:
 --------------------------------------------------------------------
 Apache License 2.0
 
 -------NOTICE.txt-----
 Elastic go-sysinfo
-Copyright 2017-2018 Elasticsearch B.V.
+Copyright 2017-2019 Elasticsearch B.V.
 
 This product includes software developed at
 Elasticsearch, B.V. (https://www.elastic.co/).