atmos 1.81.0 (fix after release tag rename)

[stefanb]

Noticed while testing

• go 1.23.0, go@1.22 1.22.6 (new formula) #175310

  ==> Downloading https://github.com/cloudposse/atmos/archive/refs/tags/1.81.0.tar.gz
  curl: (22) The requested URL returned error: 404

It seems that after

• atmos 1.81.0 #174663

the tag 1.81.0 was renamed to v1.81.0.

See

• Fix tags naming cloudposse/.github#108
• https://github.com/cloudposse/atmos/releases

Note, that the sha256 hash of the content stayed the same.

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