Update Terraform helm to ~> 2.15.0

This MR contains the following updates:

Package	Type	Update	Change
helm (source)	required_provider	minor	~> 2.14.0 -> ~> 2.15.0

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Release Notes

hashicorp/terraform-provider-helm (helm)

v2.15.0

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ENHANCEMENT:

• resource/helm_release: add upgrade_install boolean attribute to enable idempotent release installation, addressing components of GH-425 [GH-1247]

v2.14.1

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DEPENDENCIES:

• Bump golang.org/x/crypto from v0.23.0 to v0.25.0 [GH-1399]
• Bump k8s.io/api from v0.30.0 to v0.30.3 [GH-1436]
• Bump k8s.io/apimachinery from v0.30.0 to v0.30.3 [GH-1436]
• Bump k8s.io/client-go from v0.30.0 to v0.30.3 [GH-1436]
• Bump helm.sh/helm/v3 from v3.13.2 to v3.15.3 [GH-1422]

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