PMM-7689 Updated Toolkit deps (#248)

* PMM-7869 Updated Toolkit deps

The real fix is in a field in Percona Toolkit mongolib.
This PR only updated the library referenced version.

* Formatted code

go.mod

@@ -9,7 +9,7 @@ require (
 	github.com/AlekSi/pointer v1.1.0
 	github.com/alecthomas/kong v0.2.11
 	github.com/percona/exporter_shared v0.7.2
-	github.com/percona/percona-toolkit v0.0.0-20200908164809-0aac7b4cfc30
+	github.com/percona/percona-toolkit v0.0.0-20210317160132-05526474504f
 	github.com/pkg/errors v0.9.1
 	github.com/prometheus/client_golang v1.7.1
 	github.com/prometheus/client_model v0.2.0