ci: Update reference commit for ABI stability check (#1942)

Signed-off-by: Larry Gritz <[email protected]>

Author: lgritz

.github/workflows/ci.yml

@@ -330,7 +330,7 @@ jobs:
             fmt_ver: 10.1.1
             pybind11_ver: v2.10.0
             skip_tests: 1
-            abi_check: 42ccf223af1e929fd84a13773e8748b719b1e595
+            abi_check: d8f28b82458754d8a109c76d8a77d61fa02cb33b
             setenvs: export OSL_CMAKE_FLAGS="-DOSL_BUILD_TESTS=0 -DBUILD_TESTING=OFF -DUSE_QT=0"
                             OPENIMAGEIO_CMAKE_FLAGS="-DUSE_PYTHON=0"
                             CMAKE_BUILD_TYPE=RelWithDebInfo