[Backport release-24.11] slackdump: 2.6.0 -> 2.6.1

[nixpkgs-ci]

Bot-based backport to release-24.11, triggered by a label in #369565.

• Before merging, ensure that this backport is acceptable for the release.
  • Even as a non-commiter, if you find that it is not acceptable, leave a comment.

[wolfgangwalther]

nixpkgs-review result

Generated using nixpkgs-review.

Command: nixpkgs-review pr 369572

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x86_64-linux

✅ 1 package built:

• slackdump

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x86_64-darwin

❌ 1 package failed to build:

• slackdump

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aarch64-darwin

❌ 1 package failed to build:

• slackdump

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Those darwin failures look like sandbox related build failures.