Update asl to 0.5.0, use the new Bazel cc toolchain

BUILD.bazel

@@ -18,15 +18,3 @@ refresh_compile_commands(
     name = "refresh_clangd",
     targets = "//...",
 )
-
-platform(
-    name = "x64_windows-clang-cl",
-    constraint_values = [
-        "@platforms//cpu:x86_64",
-        "@platforms//os:windows",
-        # @Todo(bazel) Bit weird to use a private thing.
-        # We used to use @bazel_tools//tools/cpp:clang-cl but it's deprecated
-        # in favor of... this?...
-        "@rules_cc//cc/private/toolchain:clang-cl",
-    ],
-)