fix: temporarily pin decaffeinate-parser to 9.0.0
fix: temporarily pin decaffeinate-parser to 9.0.0

I introduced a regression in 9.0.1 that I intend to fix but not at this moment.

decaffeinate/decaffeinate,eventualbuddha/decaffeinate,alangpierce/decaffeinate,eventualbuddha/decaffeinate,decaffeinate/decaffeinate,alangpierce/decaffeinate,alangpierce/decaffeinate