Arm backend: Pin pybind11 version when installing tosa_serialization (#18036)

* To account for potential edge cases of pybind11 drifting
* Will be removed when tosa-tools is installed from pypi

Signed-off-by: Tom Allsop <tom.allsop@arm.com>

Author: tom-arm

.ci/scripts/unittest-linux-cmake.sh

@@ -19,6 +19,8 @@ if ! python -c "import tosa_serializer" >/dev/null 2>&1; then
     TOSA_SERIALIZATION_DIR="${TOSA_TOOLS_DIR}/serialization"
   fi
 
+  # NOTE: Will be removed when tosa-tools is installed via pypi
+  python -m pip install pybind11==2.10.4
   CMAKE_POLICY_VERSION_MINIMUM=3.5 BUILD_PYBIND=1 \
     python -m pip install --no-dependencies \
     "${TOSA_SERIALIZATION_DIR}"

backends/arm/requirements-arm-tosa.txt

@@ -7,3 +7,5 @@ ml_dtypes == 0.5.1
 flatbuffers == 24.3.25
 tosa-adapter-model-explorer == 0.1.0
 ai-edge-model-explorer >= 0.1.16
+# NOTE: Will be removed when tosa-tools is installed via pypi
+pybind11 == 2.10.4