chore(deps): update com_grail_bazel_toolchain digest to 0a9feb7 (#209)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| com_grail_bazel_toolchain | http_archive | digest | `42fa12b` ->
`0a9feb7` |

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WORKSPACE.bazel

@@ -13,9 +13,9 @@ hedron_compile_commands_setup()
 
 http_archive(
     name = "com_grail_bazel_toolchain",
-    sha256 = "aae35819d7fad92047f7ffcc3e7d0c360b6f35b893ff51f74b21f13434528d2c",
-    strip_prefix = "bazel-toolchain-42fa12b88d85404d29434c43a3a0400c1221a70e",
-    url = "https://github.com/grailbio/bazel-toolchain/archive/42fa12b88d85404d29434c43a3a0400c1221a70e.zip",
+    sha256 = "24494cf1fa417234a856cf1b0e867a0178509ffebf85c6848a1072e70290484d",
+    strip_prefix = "bazel-toolchain-0a9feb723796f6eb9e9947ccffa629964ec4680f",
+    url = "https://github.com/grailbio/bazel-toolchain/archive/0a9feb723796f6eb9e9947ccffa629964ec4680f.zip",
 )
 
 load("@com_grail_bazel_toolchain//toolchain:deps.bzl", "bazel_toolchain_dependencies")