Update boringssl digest to cb6da2b

Author: renovate[bot]

bazel/zetasql_deps_step_2.bzl

@@ -218,10 +218,10 @@ py_library(
                 name = "boringssl",
                 # Commit from 2021-11-01
                 urls = [
-                    "https://github.com/google/boringssl/archive/4fb158925f7753d80fb858cb0239dff893ef9f15.tar.gz",
+                    "https://github.com/google/boringssl/archive/cb6da2b637b89a289403a08f3c5d8d4f75b9227c.tar.gz",
                 ],
-                sha256 = "e168777eb0fc14ea5a65749a2f53c095935a6ea65f38899a289808fb0c221dc4",
-                strip_prefix = "boringssl-4fb158925f7753d80fb858cb0239dff893ef9f15",
+                sha256 = "980fd873cb7e01b2df47feee7e660fd6fe793e13fabe786abaf21d695ae6fb24",
+                strip_prefix = "boringssl-cb6da2b637b89a289403a08f3c5d8d4f75b9227c",
             )
 
         # Farmhash