release: prepare agent 0.6.7

agent/go/cmd/rmm-agent/main.go

@@ -24,7 +24,7 @@ import (
 	"time"
 )
 
-const agentVersion = "0.6.6"
+const agentVersion = "0.6.7"
 
 type agentRuntimeHealth struct {
 	StartedAt            time.Time

agent/go/cmd/rmm-agent/main_test.go

@@ -12,7 +12,7 @@ import (
 )
 
 func TestAgentVersionIsStable(t *testing.T) {
-	if agentVersion != "0.6.6" {
+	if agentVersion != "0.6.7" {
 		t.Fatalf("unexpected agent version %q", agentVersion)
 	}
 }