build: Switch to gopsutil's v3 module (#7191)

go.mod

@@ -3,7 +3,6 @@ module github.com/syncthing/syncthing
 require (
 	github.com/AudriusButkevicius/pfilter v0.0.0-20190627213056-c55ef6137fc6
 	github.com/AudriusButkevicius/recli v0.0.5
-	github.com/StackExchange/wmi v0.0.0-20190523213315-cbe66965904d // indirect
 	github.com/bkaradzic/go-lz4 v0.0.0-20160924222819-7224d8d8f27e
 	github.com/calmh/xdr v1.1.0
 	github.com/ccding/go-stun v0.1.2
@@ -15,7 +14,6 @@ require (
 	github.com/flynn-archive/go-shlex v0.0.0-20150515145356-3f9db97f8568
 	github.com/getsentry/raven-go v0.2.0
 	github.com/go-ldap/ldap/v3 v3.2.4
-	github.com/go-ole/go-ole v1.2.4 // indirect
 	github.com/gobwas/glob v0.2.3
 	github.com/gogo/protobuf v1.3.1
 	github.com/golang/groupcache v0.0.0-20200121045136-8c9f03a8e57e
@@ -37,7 +35,7 @@ require (
 	github.com/prometheus/client_golang v1.8.0
 	github.com/rcrowley/go-metrics v0.0.0-20200313005456-10cdbea86bc0
 	github.com/sasha-s/go-deadlock v0.2.0
-	github.com/shirou/gopsutil v3.20.10+incompatible
+	github.com/shirou/gopsutil/v3 v3.20.11
 	github.com/syncthing/notify v0.0.0-20201210100135-17de26665ddc
 	github.com/syndtr/goleveldb v1.0.1-0.20200815071216-d9e9293bd0f7
 	github.com/thejerf/suture/v4 v4.0.0