Merge branch 'master' into gb/pkgconfig-fallback

.github/mergify.yml

.github/workflows/changelogs.yml

.github/workflows/users-guide.yml

.github/workflows/validate.yml

.github/workflows/whitespace.yml

...yntax/src/Distribution/PackageDescription/FieldGrammar.hs

Cabal-syntax/src/Language/Haskell/Extension.hs

Cabal-tests/tests/UnitTests/Distribution/Utils/Structured.hs

Cabal/src/Distribution/Simple/Build.hs

Cabal/src/Distribution/Simple/Build/PathsModule/Z.hs

cabal-install/src/Distribution/Client/CmdBuild.hs

cabal-install/src/Distribution/Client/CmdHaddockProject.hs

cabal-install/src/Distribution/Client/CmdListBin.hs

cabal-install/src/Distribution/Client/CmdRepl.hs

cabal-install/src/Distribution/Client/CmdRun.hs

...l-install/src/Distribution/Client/ProjectOrchestration.hs

cabal-install/src/Distribution/Client/ScriptUtils.hs

cabal-install/src/Distribution/Client/Setup.hs

cabal-install/tests/IntegrationTests2.hs

...install/tests/IntegrationTests2/nix-config/default-config