chore(deps): update com_grail_bazel_toolchain digest to ce21d8b

Author: renovate[bot]

WORKSPACE.bazel

@@ -47,9 +47,9 @@ hedron_compile_commands_setup()
 
 http_archive(
     name = "com_grail_bazel_toolchain",
-    sha256 = "51f4baa3bad0fd7ad3a20a12462549b6a2dc329db32226a513d4c648724bb24c",
-    strip_prefix = "bazel-toolchain-ceeedcc4464322e05fe5b8df3749cc02273ee083",
-    url = "https://github.com/grailbio/bazel-toolchain/archive/ceeedcc4464322e05fe5b8df3749cc02273ee083.zip",
+    sha256 = "ca1f33751aeafc1668097c2c7c2df3357ee07c5a3cefbc15f45bfd5151ccbab4",
+    strip_prefix = "bazel-toolchain-ce21d8b199917fc27d65ddfe1f52ce3d5311b2eb",
+    url = "https://github.com/grailbio/bazel-toolchain/archive/ce21d8b199917fc27d65ddfe1f52ce3d5311b2eb.zip",
 )
 
 load("@com_grail_bazel_toolchain//toolchain:deps.bzl", "bazel_toolchain_dependencies")