Add support for repositories body parameter when creating installation access tokens

[dwnusbaum]

Description

This PR adds support for the repositories body parameter as specified in https://docs.github.com/en/rest/apps/apps#create-an-installation-access-token-for-an-app to GHAppCreateTokenBuilder.

Originally, if you wanted to generate an installation access token limited to a specific repository, the /app/installations/{installation_id}/access_tokens endpoint required you to pass a repository_ids body parameter. That parameter is a bit awkward because generally you will need to make an additional API call to retrieve the ID of a repository given its name.

At some point (I could not find a changelog) GitHub added a repositories body parameter that works like repository_ids, but accepts repository names rather than IDs, which is a nice improvement.

Before submitting a PR:

• [x] Changes must not break binary backwards compatibility. If you are unclear on how to make the change you think is needed while maintaining backward compatibility, CONTRIBUTING.md for details.
• [x] Add JavaDocs and other comments as appropriate. Consider including links in comments to relevant documentation on https://docs.github.com/en/rest .
• [x] Add tests that cover any added or changed code. This generally requires capturing snapshot test data. See CONTRIBUTING.md for details.
• [x] Run mvn -D enable-ci clean install site locally. If this command doesn't succeed, your change will not pass CI.
• [x] Push your changes to a branch other than main. You will create your PR from that branch.

When creating a PR:

• [x] Fill in the "Description" above with clear summary of the changes. This includes:
  • [ ] If this PR fixes one or more issues, include "Fixes #" lines for each issue.
  • [x] Provide links to relevant documentation on https://docs.github.com/en/rest where possible.
• [x] All lines of new code should be covered by tests as reported by code coverage. Any lines that are not covered must have PR comments explaining why they cannot be covered. For example, "Reaching this particular exception is hard and is not a particular common scenario."
• [x] Enable "Allow edits from maintainers".

[codecov[bot]]

Codecov Report

Merging #1492 (bd27d76) into main (08785e5) will increase coverage by 0.00%. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##               main    #1492   +/-   ##
=========================================
  Coverage     78.80%   78.81%           
- Complexity     2113     2114    +1     
=========================================
  Files           202      202           
  Lines          6427     6429    +2     
  Branches        361      361           
=========================================
+ Hits           5065     5067    +2     
  Misses         1152     1152           
  Partials        210      210           

Impacted Files	Coverage Δ
...va/org/kohsuke/github/GHAppCreateTokenBuilder.java	85.71% <100.00%> (+1.50%)	:arrow_up:

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