terramaid: deprecate

[stefanb]

Ref:

• 2.15.3 release changed checksum RoseSecurity/Terramaid#565 (comment)
• Closes terramaid: update checksum for 2.15.3 release #290269
• go 1.27rc2, go@1.26 1.26.5 (new formula) #288803

I don't think we have a replacement formula (for Hashicorp licensing reasons) that would (once released) include:

• add Mermaid graph format to terraform graph command hashicorp/terraform#38719

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