Disable stack_snapshot lock file on Windows

It was pinned on Linux and contains platform specific dependencies, e.g.
`unix`.

WORKSPACE

@@ -90,7 +90,7 @@ stack_snapshot(
     ],
     setup_deps = {"polysemy": ["cabal-doctest"]},
     snapshot = test_stack_snapshot,
-    stack_snapshot_json = "//:stackage_snapshot.json",
+    stack_snapshot_json = "//:stackage_snapshot.json" if not is_windows else None,
     tools = [
         # This is not required, as `stack_snapshot` would build alex
         # automatically, however it is used as a test for user provided
@@ -106,14 +106,14 @@ stack_snapshot(
     extra_deps = {"zlib": ["//tests:zlib"]},
     packages = ["zlib"],
     snapshot = test_stack_snapshot,
-    stack_snapshot_json = "//:stackage-zlib-snapshot.json",
+    stack_snapshot_json = "//:stackage-zlib-snapshot.json" if not is_windows else None,
 )
 
 stack_snapshot(
     name = "stackage-pinning-test",
     local_snapshot = "//:stackage-pinning-test.yaml",
     packages = ["hspec"],
-    stack_snapshot_json = "//:stackage-pinning-test_snapshot.json",
+    stack_snapshot_json = "//:stackage-pinning-test_snapshot.json" if not is_windows else None,
 )
 
 stack_snapshot(
@@ -126,7 +126,7 @@ stack_snapshot(
     haddock = False,
     local_snapshot = "//:ghcide-stack-snapshot.yaml",
     packages = ["ghcide"],
-    stack_snapshot_json = "//:ghcide-snapshot.json",
+    stack_snapshot_json = "//:ghcide-snapshot.json" if not is_windows else None,
 )
 
 load(