chore: bump opentofu to 1.8.8, add tf 1.9.8, and drop 1.6/1.7 support#5211

chenrui333 merged 1 commit intomainrunatlantis/atlantis:mainfrom

opentofu-1.8.8-tf-updaterunatlantis/atlantis:opentofu-1.8.8-tf-updateCopy head branch name to clipboard