Update com_grail_bazel_toolchain digest to 1cf6ea8 (#260)

[![Mend
Renovate](https://app.renovatebot.com/images/banner.svg)](https://renovatebot.com)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| com_grail_bazel_toolchain | http_archive | digest | `c217c03` ->
`1cf6ea8` |

---

### Configuration

📅 **Schedule**: Branch creation - At any time (no schedule defined),
Automerge - At any time (no schedule defined).

🚦 **Automerge**: Enabled.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the
rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update
again.

---

- [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check
this box

---

This PR has been generated by [Mend
Renovate](https://www.mend.io/free-developer-tools/renovate/). View
repository job log
[here](https://developer.mend.io/github/seaube/bazel_sundry).

<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzNi44My4wIiwidXBkYXRlZEluVmVyIjoiMzYuODMuMCIsInRhcmdldEJyYW5jaCI6Im1haW4ifQ==-->

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

WORKSPACE.bazel

@@ -22,9 +22,9 @@ hedron_compile_commands_setup()
 
 http_archive(
     name = "com_grail_bazel_toolchain",
-    sha256 = "c53acf847fb52198758635490c5e987aacc7c64a5731a4027824762ba4e3f961",
-    strip_prefix = "bazel-toolchain-c217c03479717279035906273702b8bc3309bbb4",
-    url = "https://github.com/grailbio/bazel-toolchain/archive/c217c03479717279035906273702b8bc3309bbb4.zip",
+    sha256 = "ace128aab7343b398a62e18010a6ea6323afecf780f72642b12e61d556eeecf5",
+    strip_prefix = "bazel-toolchain-1cf6ea867f5fe4dbdc8a9994b985ad94327ee5d3",
+    url = "https://github.com/grailbio/bazel-toolchain/archive/1cf6ea867f5fe4dbdc8a9994b985ad94327ee5d3.zip",
 )
 
 load("@com_grail_bazel_toolchain//toolchain:deps.bzl", "bazel_toolchain_dependencies")