Merge pull request #6956 from phadej/bump-version-to-3.4

.github/workflows/artifacts.yml

.github/workflows/bootstrap.yml

.github/workflows/linux.yml

.github/workflows/macos.yml

.github/workflows/quick-jobs.yml

.github/workflows/windows.yml

Cabal/Cabal-QuickCheck/Cabal-QuickCheck.cabal

Cabal/Cabal-described/Cabal-described.cabal

Cabal/Cabal-tree-diff/Cabal-tree-diff.cabal

Cabal/Cabal.cabal

Cabal/Makefile

Cabal/doc/conf.py

appveyor.yml

boot/ci-artifacts.template.yml

boot/ci-bootstrap.template.yml

boot/ci-linux.template.yml

boot/ci-macos.template.yml

boot/ci-quick-jobs.template.yml

boot/ci-windows.template.yml

cabal-install/bootstrap.sh