fix: use correct getter for members_can_fork_private_repositories in org data source (#3359)

The github_organization data source was using
GetMembersCanCreatePrivateRepos() instead of
GetMembersCanForkPrivateRepos() to populate the
members_can_fork_private_repositories attribute, causing it to
return the value of members_can_create_private_repositories instead.

Co-authored-by: Claude Opus 4.7 (1M context) <[email protected]>

Author: andrewesweet

github/data_source_github_organization.go

@@ -254,7 +254,7 @@ func dataSourceGithubOrganizationRead(ctx context.Context, d *schema.ResourceDat
 		_ = d.Set("members_can_create_public_repositories", organization.GetMembersCanCreatePublicRepos())
 		_ = d.Set("members_can_create_private_repositories", organization.GetMembersCanCreatePrivateRepos())
 		_ = d.Set("members_can_create_internal_repositories", organization.GetMembersCanCreateInternalRepos())
-		_ = d.Set("members_can_fork_private_repositories", organization.GetMembersCanCreatePrivateRepos())
+		_ = d.Set("members_can_fork_private_repositories", organization.GetMembersCanForkPrivateRepos())
 		_ = d.Set("web_commit_signoff_required", organization.GetWebCommitSignoffRequired())
 		_ = d.Set("members_can_create_pages", organization.GetMembersCanCreatePages())
 		_ = d.Set("members_can_create_public_pages", organization.GetMembersCanCreatePublicPages())