Update reference to rules_cc to main.zip. This is required by bazelbu…

…ild/rules_cc#107

The longer term solution is:
- To use a named release of rules_cc once that is available (See bazelbuild/rules_cc#91)
- Wrap the `http_archive` rules with `maybe` so that there will not be conflicts if downstream users try to mix rules_cc versions.

PiperOrigin-RevId: 382526074

WORKSPACE

@@ -6,7 +6,7 @@ load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
 http_archive(
     name = "rules_cc",
     strip_prefix = "rules_cc-master",
-    urls = ["https://github.com/bazelbuild/rules_cc/archive/master.zip"],
+    urls = ["https://github.com/bazelbuild/rules_cc/archive/main.zip"],
 )
 
 # Google Test framework, used by most unit-tests.