chore: fix path

Author: dyladan

experimental/packages/opentelemetry-exporter-otlp-http/karma.conf.js

@@ -15,7 +15,7 @@
  */
 
 const karmaWebpackConfig = require('../../../karma.webpack');
-const karmaBaseConfig = require('../../../.base');
+const karmaBaseConfig = require('../../../karma.base');
 
 module.exports = (config) => {
   config.set(Object.assign({}, karmaBaseConfig, {