[testing-karma] update karma-esm to the latest version

[phetw]

@open-wc/testing-karma should update @open-wc/karma-esm to version with the latest version of es-dev-server which uses newer version of @rollup/plugin-node-resolve. Otherwise there will be 2 versions of this rollup plugins and different configs need to be maintain when using @open-wc/testing-karma with es-dev-server

├─┬ @open-wc/[email protected]
│ └─┬ @open-wc/[email protected]
│   └─┬ [email protected]
│     └── @rollup/[email protected] 
└─┬ [email protected]
  └── @rollup/[email protected]