[BUG]: Allow setting review notifications without delegation

[mering]

Expected Behavior

It should be possible to set github_team_settings.review_request_delegation.notify without enabling auto assignment.

These are independent settings:

Actual Behavior

When only setting notify, terraform apply fails with

Error: Review request delegation member count must be greater than 0

Terraform Version

Terraform v1.8.3
on linux_amd64

• provider registry.terraform.io/integrations/github v5.39.0

Affected Resource(s)

• github_team_settings

Terraform Configuration Files

No response

Steps to Reproduce

No response

Debug Output

No response

Panic Output

No response

Code of Conduct

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