fix!: Remove ListOptions from PullRequestsService.ListReviewers

[maishivamhoo123]

BREAKING CHANGE: PullRequestsService.ListReviewers no longer has opts *ListOptions.

Issue Related : #3976
This PR Remove the ListOptions argument from ListReviewers function signature as it doesn't supports pagination as mentioned in [https://docs.github.com/en/rest/pulls/review-requests?apiVersion=2022-11-28#get-all-requested-reviewers-for-a-pull-request](Get all Request Reviewer List Docs)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.60%. Comparing base (a8a36ab) to head (5e08a90).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4009      +/-   ##
==========================================
- Coverage   93.60%   93.60%   -0.01%     
==========================================
  Files         207      207              
  Lines       17834    17831       -3     
==========================================
- Hits        16693    16690       -3     
  Misses        939      939              
  Partials      202      202              

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[gmlewis]

Very interesting! This PR demonstrates that gen-iterators.go appears to only be targeting methods that have ListOptions or ListCursorOptions or NextPage or After in their own custom *Options structs!
I'll create an issue for this.

[gmlewis]

Thank you, @maishivamhoo123!
LGTM.
Awaiting second LGTM+Approval from any other contributor to this repo before merging.

cc: @stevehipwell - @alexandear - @zyfy29 - @Not-Dhananjay-Mishra

[gmlewis]

Thank you, @alexandear!
Merging.