chore(deps): update com_grail_bazel_toolchain digest to 42fa12b

Author: renovate[bot]

WORKSPACE.bazel

@@ -13,9 +13,9 @@ hedron_compile_commands_setup()
 
 http_archive(
     name = "com_grail_bazel_toolchain",
-    sha256 = "8c44231d2c20bc27734e2015f19b9dac1a21c4183f5c634ae6bed341c6eae5ae",
-    strip_prefix = "bazel-toolchain-27335614e4a54e06b595de093f47bebf5973c507",
-    url = "https://github.com/grailbio/bazel-toolchain/archive/27335614e4a54e06b595de093f47bebf5973c507.zip",
+    sha256 = "aae35819d7fad92047f7ffcc3e7d0c360b6f35b893ff51f74b21f13434528d2c",
+    strip_prefix = "bazel-toolchain-42fa12b88d85404d29434c43a3a0400c1221a70e",
+    url = "https://github.com/grailbio/bazel-toolchain/archive/42fa12b88d85404d29434c43a3a0400c1221a70e.zip",
 )
 
 load("@com_grail_bazel_toolchain//toolchain:deps.bzl", "bazel_toolchain_dependencies")