C408 fix
- [x] xref #38138 
- [x] tests added / passed
- [x] passes `black pandas`
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [x] whatsnew entry

Rewrote dict calls to dict literals in the following files
./pandas/tests/io/json/test_ujson.py
./pandas/tests/io/json/test_normalize.py

Also changed list calls to literals in line 730 of the following file
pandas/tests/io/json/test_ujson.py
thanks @gerardjorgensen 