This reverts commit ee38045d.

Change exitcode-stdio-1.0 description to match current status quo

Fix typo in import feature documentation

Fixes #8423

Bumps [actions/checkout](https://github.com/actions/checkout) from 2 to 3.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](https://github.com/actions/checkout/compare/v2...v3

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Avoid `Data.List.{head,tail}`

Support transformers-0.6 and mtl-2.3

Bump actions/setup-python from 2 to 4

Bumps [actions/setup-python](https://github.com/actions/setup-python) from 2 to 4.
- [Release notes](https://github.com/actions/setup-python/releases)
- [Commits](https://github.com/actions/setup-python/compare/v2...v4

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Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 2 to 3.
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- [Commits](https://github.com/actions/download-artifact/compare/v2...v3

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Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 2 to 3.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](https://github.com/actions/upload-artifact/compare/v2...v3

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Bumps [haskell/actions](https://github.com/haskell/actions) from 1 to 2.
- [Release notes](https://github.com/haskell/actions/releases)
- [Commits](https://github.com/haskell/actions/compare/v1...v2

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The C call is almost exactly the same as GHC.Conc.Sync.getNumProcessors,
and we used the C function from GHC, so there should be no actual
difference.

Add dependabot for github workflows

This will alert of outdated actions used in our workflows.

Co-authored-by: Andreas Abel <andreas.abel@ifi.lmu.de>

Fix typo in cabal-testsuite/README.md

programatically -> programmatically

* add documentation for single-file Haskell scripts

This is a useful feature which I think would benefit newcomers by being a top-level, early entry in the docs. See: https://stackoverflow.com/a/65541020

* Add project metadata and cabal run doc link

* Fix cabal run link

* Add custom anchor for 'cabal run'

* Qualify use of executable shell script to unix-likes

Hardwire a different CI cache path, to fix CI

Cache whole of ~/.cabal in bootstrap.yml to fix CI

Update Makefile

remove duplicate .docker/validate-8.6.5.dockerfile

Increase urllib.request.urlopen timeout in bootstrap.py to fix CI

* cabal init -i should sanitize suggested package name (fix #8404)

* fix existing tests

* fix more tests (golden)

* fix more tests (generators, simple)

* add regression test

* add changelog

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* do not print "up to date" unless running build

* Update cabal-tests

* Add changelog

* Remove accidentally added test generated files

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* ghc, ghc-boot, ghci should be non-upgradable

* (PR number)

* Checks for depending on GHC

* Also tests ghc-boot, ghci

* Simplify condition

* Added "rejecting:" bits

* Synced cabal-install-solver's list & Simplify testcase

* Updated changelog

* Fully remove base dependency in test dbNonUpgrade

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Document internal library syntax changes

As of cabal-version: 3.4 and higher, it's necessary to use a different
syntax to depend on internal libraries than previous versions. Document
this change in a note block in the Internal Libraries section.

See: #7565

Set urllib.request.urlopen timeout in bootstrap.py to fix CI

* build pkgconfig db individually when bulk fails

* fix typo

* changelog, comments

* address comments

* revert unnecessary extra failure check

* fix changelog

Co-authored-by: Gershom Bazerman <gershom@arista.com>
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Elaborate on XDG directories in users guide.