[workspace] Upgrade fcl_internal to latest commit

Author: Aiden McCormack

tools/workspace/fcl_internal/patches/upstream/cassert.patch

@@ -6,11 +6,8 @@ def fcl_internal_repository(
     github_archive(
         name = name,
         repository = "flexible-collision-library/fcl",
-        commit = "b03987c495b75b5d873f932b1ff3fc27c1494c87",
-        sha256 = "b055315cad3394b7bb1db8eead56a9063e95ed6cb0f43e12b244ab0bd2ce5be8",  # noqa
+        commit = "a3fbc9fe4f619d7bb1117dc137daa497d2de454b",
+        sha256 = "dd542daa13ab2f861f29792f20be50a1776859540c46360b728d1fad5d819a0c",  # noqa
         build_file = ":package.BUILD.bazel",
-        patches = [
-            ":patches/upstream/cassert.patch",
-        ],
         mirrors = mirrors,
     )