vendor: new release of gotk3

To support building under golang 1.16.x gotk3 v0.6.0 required.

Signed-off-by: Mark D Horn <mark.d.horn@intel.com>

go.mod

@@ -9,7 +9,7 @@ require (
 	github.com/coreos/go-systemd/v22 v22.0.0
 	github.com/digitalocean/go-smbios v0.0.0-20180907143718-390a4f403a8e
 	github.com/google/go-cmp v0.4.0 // indirect
-	github.com/gotk3/gotk3 v0.4.0
+	github.com/gotk3/gotk3 v0.6.0
 	github.com/huandu/xstrings v1.3.0
 	github.com/kr/text v0.2.0 // indirect
 	github.com/leonelquinteros/gotext v1.4.0

go.sum

@@ -18,6 +18,8 @@ github.com/google/go-cmp v0.4.0 h1:xsAVV57WRhGj6kEIi8ReJzQlHHqcBYCElAvkovg3B/4=
 github.com/google/go-cmp v0.4.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/gotk3/gotk3 v0.4.0 h1:TIuhyQitGeRTxOQIV3AJlYtEWWJpC74JHwAIsxlH8MU=
 github.com/gotk3/gotk3 v0.4.0/go.mod h1:Eew3QBwAOBTrfFFDmsDE5wZWbcagBL1NUslj1GhRveo=
+github.com/gotk3/gotk3 v0.6.0 h1:Aqlq4/6VabNwtCyA9M9zFNad5yHAqCi5heWnZ9y+3dA=
+github.com/gotk3/gotk3 v0.6.0/go.mod h1:/hqFpkNa9T3JgNAE2fLvCdov7c5bw//FHNZrZ3Uv9/Q=
 github.com/huandu/xstrings v1.3.0 h1:gvV6jG9dTgFEncxo+AF7PH6MZXi/vZl25owA/8Dg8Wo=
 github.com/huandu/xstrings v1.3.0/go.mod h1:y5/lhBue+AyNmUVz9RLU9xbLR0o4KIIExikq4ovT0aE=
 github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=