fix: Move cardano-ledger-specs forward one commit to fix build by `…

…stack`

deleted dead symlink "cddl-spec"

The presence of an invalid link leads to an error in the `cardano-node`
build via `stack`.
See commercialhaskell/stack#4579 for further
information.

stack.yaml

@@ -65,7 +65,7 @@ extra-deps:
   - websockets-0.12.6.1
 
   - git: https://github.com/input-output-hk/cardano-ledger-specs
-    commit: 460ee17d22cacb3ac4d90536ebe90500a356a1c9
+    commit: 370ee0ad806721fb35a3b8cee645c99e178a6ad9
     subdirs:
       # small-steps
       - semantics/executable-spec