haskell.packages.*.Cabal-syntax: expose dummy packages for GHC < 9.4

Before Cabal >= 3.8, Cabal-syntax did not exist, but there is a dummy
package Cabal-syntax-3.6.0.0 which can be used to prevent the constraint
solver from picking mutually incompatible versions of Cabal and
Cabal-syntax. Since we are now solving flags with Cabal >= 3.8, many
packages have a dependency on Cabal-syntax they did not have before,
requiring us to have a matching attribute in every package set. Using
the dummy package is the safest solution, although it is not required in
every case.

Fixes eval of jailbreak-cabal for GHC < 9.4.

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