Document ISO 8601 dates of calendar rules in the REST API spec - #192

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: pozil/auto-assign-issue@v2. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

Unexpected input(s) 'numOfAssignees', valid inputs are ['repo-token', 'assignees', 'teams', 'numOfAssignee', 'abortIfPreviousAssignees', 'removePreviousAssignees', 'allowNoAssignees', 'allowSelfAssign', 'issueNumber', 'teamIsPullRequestReviewer', 'failsIfUsersCannotBeAssigned']