customize-uploader: `--proxy` option is ignored

Target Package

@kintone/customize-uploader 4.0.9

Environment

Operating System: macOS 10.15.7
Browser: N.A.
Node.js version: v14.16.1

Current Behavior

It looks like --proxy option is not passed to api client.

js-sdk/packages/customize-uploader/src/KintoneApiClient.ts

Lines 53 to 61 in a6c7ee5

    
           this.restApiClient = new KintoneRestAPIClient({ 
        
             baseUrl: kintoneUrl, 
        
             auth, 
        
             basicAuth, 
        
             featureFlags: { 
        
               enableAbortSearchError: false, 
        
             }, 
        
             guestSpaceId, 
        
           });

Expected Behavior

--proxy option works correctly

	this.restApiClient = new KintoneRestAPIClient({
	baseUrl: kintoneUrl,
	auth,
	basicAuth,
	featureFlags: {
	enableAbortSearchError: false,
	},
	guestSpaceId,
	});