Has deprecated dependency

[tepleyna]

Depends on lodash.isequal, which is deprecated.

The following is displayed when installing json-rte-serializer using npm:

npm warn deprecated lodash.isequal@4.5.0: This package is deprecated. Use require('node:util').isDeepStrictEqual instead.

[tepleyna]

Possibly related to work in, but not solved by, this PR:
#50

[shreya-kamble]

Hi @tepleyna ,
require('node:util').isDeepStrictEqual is only available in node based environment, not in browser based.
Hence we have to rely on lodash.isequal