[Chore] Temporarily make benchs not buildable

Problem: CI refuses to build universum with GHC-9.10 because
of `gauge`. It turned out to be a deprecated package.

Solution: as temporary measure we disable building benchmarks
completely. However, we should migrate to another library later.
An issue is created for it.

universum.cabal

@@ -179,6 +179,8 @@ benchmark universum-benchmark
   ghc-options:         -Wno-missing-safe-haskell-mode
   if impl(ghc >= 9.8.0)
     ghc-options:         -Wno-x-partial
+  -- TODO (#298): migrate from gauge to something
+  buildable: False
 
   default-extensions:  NoImplicitPrelude
                        ScopedTypeVariables