[backport] fix(torsf): bump the version number

This diff backports #1357 to the release/3.19 branch.

We changed the SNI, so let's change also the version number.

Part of ooni/probe#2524.

internal/experiment/torsf/torsf.go

@@ -25,7 +25,7 @@ import (
 // We may want to have a single implementation for both nettests in the future.
 
 // testVersion is the experiment version.
-const testVersion = "0.4.0"
+const testVersion = "0.5.0"
 
 // Config contains the experiment config.
 type Config struct {

internal/experiment/torsf/torsf_test.go

@@ -25,7 +25,7 @@ func TestExperimentNameAndVersion(t *testing.T) {
 	if m.ExperimentName() != "torsf" {
 		t.Fatal("invalid experiment name")
 	}
-	if m.ExperimentVersion() != "0.4.0" {
+	if m.ExperimentVersion() != "0.5.0" {
 		t.Fatal("invalid experiment version")
 	}
 }