[workspace] Upgrade qdldl_internal to latest release v0.1.8

Author: Aiden McCormack

tools/workspace/qdldl_internal/repository.bzl

@@ -9,8 +9,8 @@ def qdldl_internal_repository(
         upgrade_advice = """
         When updating this commit, see drake/tools/workspace/qdldl/README.md.
         """,
-        commit = "v0.1.7",
-        sha256 = "631ae65f367859fa1efade1656e4ba22b7da789c06e010cceb8b29656bf65757",  # noqa
+        commit = "v0.1.8",
+        sha256 = "ecf113fd6ad8714f16289eb4d5f4d8b27842b6775b978c39def5913f983f6daa",  # noqa
         build_file = ":package.BUILD.bazel",
         mirrors = mirrors,
     )