Fix get_files test compile coverage

Author: rodboev

pkg/github/pullrequests_test.go

@@ -12,6 +12,7 @@ import (
 	"github.com/github/github-mcp-server/pkg/translations"
 	"github.com/google/go-github/v87/github"
 	"github.com/google/jsonschema-go/jsonschema"
+	"github.com/modelcontextprotocol/go-sdk/mcp"
 	"github.com/shurcooL/githubv4"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"