cryptol-remote-api: Restore the ability to build with vector-0.12.* (#…

…1506)

The downstream `saw-remote-api` library doesn't quite support `vector-0.13.*`
yet, but #1499 accidentally restricted `cryptol-remote-api`'s
build plan to only allow `vector-0.13.*`. This restores the ability to build
`cryptol-remote-api` with `vector-0.12.*` for `saw-remote-api`'s sake.

cryptol-remote-api/cryptol-remote-api.cabal

@@ -55,7 +55,7 @@ common deps
     text                 >= 1.2.3 && < 2.1,
     tf-random,
     unordered-containers ^>= 0.2,
-    vector               ^>= 0.13,
+    vector               >= 0.12 && < 0.14,
 
   default-language:    Haskell2010