chore(deps): update com_github_nelhage_rules_boost digest to 504e4db (#366)

Author: renovate-bot

pubsub-open-telemetry/WORKSPACE.bazel

@@ -47,9 +47,9 @@ grpc_extra_deps()
 # Boost
 http_archive(
     name = "com_github_nelhage_rules_boost",
-    sha256 = "202b939727f10f7bb5b6bd76632793e6a3dc03f664114bed303036651cf3d737",
-    strip_prefix = "rules_boost-e23cc59f87d5049618472d6ce0ca0ed5ef0c23dc",
-    url = "https://github.com/nelhage/rules_boost/archive/e23cc59f87d5049618472d6ce0ca0ed5ef0c23dc.tar.gz",
+    sha256 = "085aadb6cd1323740810efcde29e99838286f44e0ab060af6e2a645380316cd6",
+    strip_prefix = "rules_boost-504e4dbc8c480fac5da33035490bc2ccc59db749",
+    url = "https://github.com/nelhage/rules_boost/archive/504e4dbc8c480fac5da33035490bc2ccc59db749.tar.gz",
 )
 
 load("@com_github_nelhage_rules_boost//:boost/boost.bzl", "boost_deps")