Update gosigar to pass Metricbeat system tests (elastic#19929)

The system/filesystem tests are failing due to an unsafe pointer conversion. This
temporarily ignores the unsafe pointer conversion warning. Underlying pointer conversion
issue still needs addressed in gosigar.

elastic/gosigar#138

NOTICE.txt

@@ -7899,11 +7899,11 @@ Contents of probable licence file $GOMODCACHE/github.com/elastic/[email protected]/
 
 --------------------------------------------------------------------------------
 Dependency : github.com/elastic/gosigar
-Version: v0.10.5
+Version: v0.10.6-0.20200715000138-f115143bb233
 Licence type (autodetected): Apache-2.0
 --------------------------------------------------------------------------------
 
-Contents of probable licence file $GOMODCACHE/github.com/elastic/[email protected].5/LICENSE:
+Contents of probable licence file $GOMODCACHE/github.com/elastic/[email protected].6-0.20200715000138-f115143bb233/LICENSE:
 
                               Apache License
                         Version 2.0, January 2004

go.mod

@@ -71,7 +71,7 @@ require (
 	github.com/elastic/go-txfile v0.0.7
 	github.com/elastic/go-ucfg v0.8.3
 	github.com/elastic/go-windows v1.0.1 // indirect
-	github.com/elastic/gosigar v0.10.5
+	github.com/elastic/gosigar v0.10.6-0.20200715000138-f115143bb233
 	github.com/fatih/color v1.5.0
 	github.com/fsnotify/fsevents v0.0.0-00010101000000-000000000000
 	github.com/fsnotify/fsnotify v1.4.7

go.sum

@@ -259,8 +259,8 @@ github.com/elastic/go-ucfg v0.8.3/go.mod h1:iaiY0NBIYeasNgycLyTvhJftQlQEUO2hpF+F
 github.com/elastic/go-windows v1.0.0/go.mod h1:TsU0Nrp7/y3+VwE82FoZF8gC/XFg/Elz6CcloAxnPgU=
 github.com/elastic/go-windows v1.0.1 h1:AlYZOldA+UJ0/2nBuqWdo90GFCgG9xuyw9SYzGUtJm0=
 github.com/elastic/go-windows v1.0.1/go.mod h1:FoVvqWSun28vaDQPbj2Elfc0JahhPB7WQEGa3c814Ss=
-github.com/elastic/gosigar v0.10.5 h1:GzPQ+78RaAb4J63unidA/JavQRKrB6s8IOzN6Ib59jo=
-github.com/elastic/gosigar v0.10.5/go.mod h1:cdorVVzy1fhmEqmtgqkoE3bYtCfSCkVyjTyCIo22xvs=
+github.com/elastic/gosigar v0.10.6-0.20200715000138-f115143bb233 h1:PvAAw8rXlg0maTAhdJznCmlzVZIKPwD2BP1pljuncLA=
+github.com/elastic/gosigar v0.10.6-0.20200715000138-f115143bb233/go.mod h1:cdorVVzy1fhmEqmtgqkoE3bYtCfSCkVyjTyCIo22xvs=
 github.com/elastic/sarama v1.19.1-0.20200629123429-0e7b69039eec h1:rAHd7DeHIHjSzvnkl197GKh9TCWGKg/z2BBbbGOEiWI=
 github.com/elastic/sarama v1.19.1-0.20200629123429-0e7b69039eec/go.mod h1:X690XXMxlbtN8c7xcpsENKNlbj8VClCZ2hwSOhSyNmE=
 github.com/elazarl/goproxy v0.0.0-20180725130230-947c36da3153 h1:yUdfgN0XgIJw7foRItutHYUIhlcKzcSf5vDpdhQAKTc=