Update Terraform kubernetes to v2.8.0

This MR contains the following updates:

Package	Type	Update	Change
kubernetes (source)	required_provider	minor	2.7.1 -> 2.8.0

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Release Notes

hashicorp/terraform-provider-kubernetes

v2.8.0

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IMMROVEMENTS:

• Add mutating_webhook_configuration_v1 data source (#​1423)
• Remove enabling experiment section (#​1564)
• Update kubernetes dependencies (#​1574)
• Update terraform-plugin-go and terraform-plugin-sdk (#​1551)

BUG FIXES:

• Fix panic: lists must only contain one type of element errors on kubernetes_manifest
• Attribute backend.service.port.name in kubernetes_ingress_v1 should be type String (#​1541)

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