[MAINT]: Remove deprecated fields for v7

### Describe the need

There are currently 18 fields marked as `Deprecated` in the provider. Lets delete all of them for the next major release (v7)

- [ ] `dependabot` in `data_source_github_ip_ranges.go`
- [ ] `dependabot_ipv4` in `data_source_github_ip_ranges.go`
- [ ] `dependabot_ipv6` in `data_source_github_ip_ranges.go`
- [ ] `parent` in `data_source_github_organization_teams.go`
- [ ] `members` in `data_source_github_organization.go`
- [x] `asserts_url` in `data_source_github_release.go` https://github.com/integrations/terraform-provider-github/pull/2975
- [ ] `has_downloads` in `data_source_github_repository.go`
- [ ] `repositories` in `data_source_github_team.go`
- [ ] `results_per_page` in `data_source_github_team.go`
- [ ] `organization` in `provider.go`
- [ ] `required_status_checks.0.include_admins` in `resource_github_branch_protection_v3.go`
- [ ] `required_pull_request_reviews.0.include_admins` in `resource_github_branch_protection_v3.go`
- [ ] `has_downloads` in `resource_github_repository.go`
- [ ] `default_branch` in `resource_github_repository.go`

### SDK Version

_No response_

### API Version

_No response_

### Relevant log output

```shell

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### Code of Conduct

- [x] I agree to follow this project's Code of Conduct