nano: 8.5 -> 8.6

[trofi]

Changes: https://lists.gnu.org/archive/html/info-gnu/2025-08/msg00008.html

Things done

• Built on platform:
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• Tested, as applicable:
  • NixOS tests in nixos/tests.
  • Package tests at passthru.tests.
  • Tests in lib/tests or pkgs/test for functions and "core" functionality.
• Ran nixpkgs-review on this PR. See nixpkgs-review usage.
• Tested basic functionality of all binary files, usually in ./result/bin/.
• Nixpkgs Release Notes
  • Package update: when the change is major or breaking.
• NixOS Release Notes
  • Module addition: when adding a new NixOS module.
  • Module update: when the change is significant.
• Fits CONTRIBUTING.md, pkgs/README.md, maintainers/README.md and other READMEs.

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[nixpkgs-ci]

Backport failed for release-25.05, because it was unable to cherry-pick the commit(s).

Please cherry-pick the changes locally and resolve any conflicts.

git fetch origin release-25.05
git worktree add -d .worktree/backport-435653-to-release-25.05 origin/release-25.05
cd .worktree/backport-435653-to-release-25.05
git switch --create backport-435653-to-release-25.05
git cherry-pick -x 33bdbd0579ac551ffa18d763e3993bc190336ca8

[nixpkgs-ci]

Backport failed for release-25.05, because it was unable to cherry-pick the commit(s).

Please cherry-pick the changes locally and resolve any conflicts.

git fetch origin release-25.05
git worktree add -d .worktree/backport-435653-to-release-25.05 origin/release-25.05
cd .worktree/backport-435653-to-release-25.05
git switch --create backport-435653-to-release-25.05
git cherry-pick -x 33bdbd0579ac551ffa18d763e3993bc190336ca8