Update Terraform helm to ~> 2.6.0

This MR contains the following updates:

Package	Type	Update	Change
helm (source)	required_provider	minor	~> 2.5.0 -> ~> 2.6.0
helm (source)	required_provider	minor	~> 2.4.0 -> ~> 2.6.0

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Release Notes

hashicorp/terraform-provider-helm

v2.6.0

Compare Source

IMMROVEMENTS:

• Upgrade helm dependency to 3.9.0 (#​867)
• Add args attribute in post_render block in (#​869)
• Add pass_credentials attribute (#​841)
• Add proxy_url attribute to provider block (#​843)

BUG FIXES:

• Don't persist state when update causes an error (#​857)

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