feat: removes support for GHES 3.5 and adds new properties on codespa…

…ce endpoints, description updates, and many property type updates (#359)

* feat: schema updates on 'codespaces' endpoint and other minor updates
- added 'security_and_analysis' property
- added 'geo' property
- 'line' property not required anymore
- remove 'key' property
- update descriptions
- property type updates
* feat: schema updates for gpg-key
- remove 'subkeys' subproperty for 'gpg-key'
* feat: schema updates for Check Run
- update 'url' for externalDocs for Check Runs
- update descriptions
- remove 'status' for Check Run
* feat: many unreleased OpenAPI updates
- update descriptions
- add '/orgs/{org}/actions/runners/generate-jitconfig' endpoint
- add references to 'page' and 'per-page'
- add '/repos/{owner}/{repo}/actions/runners/generate-jitconfig' endpoint
- complement responses for some endpoints (create issue, remove repo from an app installation, list repository teams)
- add 'enabledForGitHubApps' to 'x-github' header
- add 'summary' to 'merge-group-checks-requested'
- add 'domains' to 'api-overview'
- add 'html' to ruleset
- add 'c-cpp', 'java-kotlin' and 'javascript-typescript' to 'languages'
- add 'runner-jitconfig' to schema
- add new properties to 'org-ruleset-items'
- add 'actions_runner_jitconfig' to schema

BREAKING CHANGE: Remove GHES 3.5