Fix linting in @huggingface/inference (remove unused vars)

[xenova]

Fixes failing lint CI:

packages/inference lint:check: /home/runner/work/huggingface.js/huggingface.js/packages/inference/src/tasks/nlp/tokenClassification.ts
packages/inference lint:check:   5:10  error  'toArray' is defined but never used  @typescript-eslint/no-unused-vars
packages/inference lint:check: /home/runner/work/huggingface.js/huggingface.js/packages/inference/src/tasks/nlp/zeroShotClassification.ts
packages/inference lint:check:   5:10  error  'toArray' is defined but never used  @typescript-eslint/no-unused-vars
packages/inference lint:check: ✖ 2 problems (2 errors, 0 warnings)
packages/inference lint:check: Failed

From #1315 (cc @hanouticelina for viz). Strange that in that PR, the CI didn't catch it (the last commit was marked as ✅). May need to investigate (cc @coyotte508)

[hanouticelina]

Thank you! indeed, it's weird the CI was ✅

[xenova]

All good! Thanks for the speedy review! 🤗