chore(deps): update com_grail_bazel_toolchain digest to a76d197 (#66)

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

Author: renovate[bot]

WORKSPACE.bazel

@@ -40,9 +40,9 @@ hedron_compile_commands_setup()
 
 http_archive(
     name = "com_grail_bazel_toolchain",
-    sha256 = "02bc1a9419d52196b7c715d20292f04ab8a6970652c10143dcffd10d77f84498",
-    strip_prefix = "bazel-toolchain-91abcad9e44ea47cff7b95962b7b62fc2e885dc5",
-    url = "https://github.com/grailbio/bazel-toolchain/archive/91abcad9e44ea47cff7b95962b7b62fc2e885dc5.zip",
+    sha256 = "038714c166a54d5b630a0dcfb8e0cbc2840616dafac15f227eb36a047a7c9a22",
+    strip_prefix = "bazel-toolchain-a76d197a47ad7dbfc9374ccd5691cb4ebd985607",
+    url = "https://github.com/grailbio/bazel-toolchain/archive/a76d197a47ad7dbfc9374ccd5691cb4ebd985607.zip",
 )
 
 load("@com_grail_bazel_toolchain//toolchain:deps.bzl", "bazel_toolchain_dependencies")