fix(expvars): embed time/tzdata in tests to fix Windows CI flake

Author: pgimalac

pkg/collector/runner/expvars/expvars_test.go

@@ -14,6 +14,7 @@ import (
 	"sync"
 	"testing"
 	"time"
+	_ "time/tzdata"
 
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"