Removing the all target from caching

It builds all project packages even if we they are not buildables
(and are not included in hls due to flags)
Its goal was build all tests and benchmarks but --enable-tests
ans --enable-benchmarks should work
Last one does not: haskell/cabal#6259

Author: jneira

.github/workflows/caching.yml

@@ -45,7 +45,7 @@ on:
     - cron: "25 2/8 * * *"
 
 env:
-  cabalBuild: "v2-build all --keep-going"
+  cabalBuild: "v2-build --keep-going"
 
 jobs: