Update to cabal-install-3.4.0.0

3.4.0.0 Oleg Grenrus <oleg.grenrus@iki.fi> February 2021
* See https://github.com/haskell/cabal/blob/master/release-notes/cabal-install-3.4.0.0.md

3.2.0.0 Herbert Valerio Riedel <hvr@gnu.org> April 2020
* `v2-build` (and other `v2-`prefixed commands) now accept the
  `--benchmark-option(s)` flags, which pass options to benchmark executables
  (analogous to how `--test-option(s)` works). (#6209)
* Add solver optimization to skip a version of a package if it does not resolve
  any conflicts encountered in the last version, controlled by flag
  '--fine-grained-conflicts'. (#5918)
* `cabal v2-exec` doesn't fail in clean package (#6479)
* Show full ABI hash for installed packages in solver log (#5892)
* Create incoming directory even for empty packages (#4130)
* Start GHCi with `main-is` module in scope (#6311)
* Implement `--benchmark-options` for `v2-bench` (#6224)
* Fix store-dir in ghc env files generated by `cabal install --lib
  --package-env` (#6298)
* `cabal v2-run` works with `.lhs` files (#6134)
* `subdir` in source-repository-package accepts multiple entries (#5472)

3.0.1.0 Herbert Valerio Riedel <hvr@gnu.org> April 2020
* Create store incoming directory
  ([#4130](https://github.com/haskell/cabal/issues/4130))
* `fetchRepoTarball` output is not marked
  ([#6385](https://github.com/haskell/cabal/pull/6385))
* Update `setupMinCabalVersionConstraint` for GHC-8.8
  ([#6217](https://github.com/haskell/cabal/pull/6217))
* Implement `cabal install --ignore-project`
  ([#5919](https://github.com/haskell/cabal/issues/5919))
* `cabal install executable` solver isn't affected by default
  environment contents
  ([#6410](https://github.com/haskell/cabal/issues/6410))
* Use `lukko` for file locking
  ([#6345](https://github.com/haskell/cabal/pull/6345))
* Use `hackage-security-0.6`
  ([#6388](https://github.com/haskell/cabal/pull/6388))
* Other dependency upgrades

(pho)